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Finding the Fourth Proportional to 8,403.62, 12,605.42 and 8,391.47

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Solution

The fourth proportional to 8,403.62, 12,605.42 and 8,391.47 is: 12,587.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,403.62 : 12,605.42 = 8,391.47 : x
  2. Step 2: Convert to fraction form
    8,403.62/12,605.42 = 8,391.47/x
  3. Step 3: Cross multiply
    8,403.62x = 12,605.42 × 8,391.47
  4. Step 4: Simplify right side
    8,403.62x = 105,777,961.72
  5. Step 5: Solve for x
    x = 105,777,961.72/8,403.62
  6. Step 6: Final answer
    x = 12,587.20

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.