Home / 21,820.80-30,115.56-13,321.16

Finding the Fourth Proportional to 21,820.80, 30,115.56 and 13,321.16

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Solution

The fourth proportional to 21,820.80, 30,115.56 and 13,321.16 is: 18,384.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.80 : 30,115.56 = 13,321.16 : x
  2. Step 2: Convert to fraction form
    21,820.80/30,115.56 = 13,321.16/x
  3. Step 3: Cross multiply
    21,820.80x = 30,115.56 × 13,321.16
  4. Step 4: Simplify right side
    21,820.80x = 401,174,193.25
  5. Step 5: Solve for x
    x = 401,174,193.25/21,820.80
  6. Step 6: Final answer
    x = 18,384.94

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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.