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Finding the Fourth Proportional to 28,319.40, 42,479.10 and 21,407.40

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Solution

The fourth proportional to 28,319.40, 42,479.10 and 21,407.40 is: 32,111.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,319.40 : 42,479.10 = 21,407.40 : x
  2. Step 2: Convert to fraction form
    28,319.40/42,479.10 = 21,407.40/x
  3. Step 3: Cross multiply
    28,319.40x = 42,479.10 × 21,407.40
  4. Step 4: Simplify right side
    28,319.40x = 909,367,085.34
  5. Step 5: Solve for x
    x = 909,367,085.34/28,319.40
  6. Step 6: Final answer
    x = 32,111.10

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.