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Finding the Fourth Proportional to 15,720.88, 21,691.92 and 9,349.60

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Solution

The fourth proportional to 15,720.88, 21,691.92 and 9,349.60 is: 12,900.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.88 : 21,691.92 = 9,349.60 : x
  2. Step 2: Convert to fraction form
    15,720.88/21,691.92 = 9,349.60/x
  3. Step 3: Cross multiply
    15,720.88x = 21,691.92 × 9,349.60
  4. Step 4: Simplify right side
    15,720.88x = 202,810,775.23
  5. Step 5: Solve for x
    x = 202,810,775.23/15,720.88
  6. Step 6: Final answer
    x = 12,900.73

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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.