Home / 21,221.58-29,269.35-15,554.19

Finding the Fourth Proportional to 21,221.58, 29,269.35 and 15,554.19

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Solution

The fourth proportional to 21,221.58, 29,269.35 and 15,554.19 is: 21,452.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221.58 : 29,269.35 = 15,554.19 : x
  2. Step 2: Convert to fraction form
    21,221.58/29,269.35 = 15,554.19/x
  3. Step 3: Cross multiply
    21,221.58x = 29,269.35 × 15,554.19
  4. Step 4: Simplify right side
    21,221.58x = 455,261,031.08
  5. Step 5: Solve for x
    x = 455,261,031.08/21,221.58
  6. Step 6: Final answer
    x = 21,452.74

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Half scale
Find fourth proportional to 42,443.16, 58,538.70 and 31,108.38
Double scale
Find fourth proportional to 21,222.58, 29,270.73 and 15,555.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.