Home / 15,397.20-21,240.57-9,729.21

Finding the Fourth Proportional to 15,397.20, 21,240.57 and 9,729.21

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Solution

The fourth proportional to 15,397.20, 21,240.57 and 9,729.21 is: 13,421.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,397.20 : 21,240.57 = 9,729.21 : x
  2. Step 2: Convert to fraction form
    15,397.20/21,240.57 = 9,729.21/x
  3. Step 3: Cross multiply
    15,397.20x = 21,240.57 × 9,729.21
  4. Step 4: Simplify right side
    15,397.20x = 206,653,966.05
  5. Step 5: Solve for x
    x = 206,653,966.05/15,397.20
  6. Step 6: Final answer
    x = 13,421.53

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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.