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Finding the Fourth Proportional to 15,097.53, 20,821.80 and 9,720.90

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Solution

The fourth proportional to 15,097.53, 20,821.80 and 9,720.90 is: 13,406.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,097.53 : 20,821.80 = 9,720.90 : x
  2. Step 2: Convert to fraction form
    15,097.53/20,821.80 = 9,720.90/x
  3. Step 3: Cross multiply
    15,097.53x = 20,821.80 × 9,720.90
  4. Step 4: Simplify right side
    15,097.53x = 202,406,635.62
  5. Step 5: Solve for x
    x = 202,406,635.62/15,097.53
  6. Step 6: Final answer
    x = 13,406.61

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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.