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Finding the Fourth Proportional to 28,000.65, 38,640.90 and 15,425.40

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Solution

The fourth proportional to 28,000.65, 38,640.90 and 15,425.40 is: 21,287.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.65 : 38,640.90 = 15,425.40 : x
  2. Step 2: Convert to fraction form
    28,000.65/38,640.90 = 15,425.40/x
  3. Step 3: Cross multiply
    28,000.65x = 38,640.90 × 15,425.40
  4. Step 4: Simplify right side
    28,000.65x = 596,051,338.86
  5. Step 5: Solve for x
    x = 596,051,338.86/28,000.65
  6. Step 6: Final answer
    x = 21,287.05

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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.