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Finding the Fourth Proportional to 6,640.86, 9,135.98 and 6,456.39

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Solution

The fourth proportional to 6,640.86, 9,135.98 and 6,456.39 is: 8,882.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.86 : 9,135.98 = 6,456.39 : x
  2. Step 2: Convert to fraction form
    6,640.86/9,135.98 = 6,456.39/x
  3. Step 3: Cross multiply
    6,640.86x = 9,135.98 × 6,456.39
  4. Step 4: Simplify right side
    6,640.86x = 58,985,449.91
  5. Step 5: Solve for x
    x = 58,985,449.91/6,640.86
  6. Step 6: Final answer
    x = 8,882.20

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Double scale
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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.