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Finding the Fourth Proportional to 12,613.92, 18,920.88 and 5,217

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Solution

The fourth proportional to 12,613.92, 18,920.88 and 5,217 is: 7,825.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,613.92 : 18,920.88 = 5,217 : x
  2. Step 2: Convert to fraction form
    12,613.92/18,920.88 = 5,217/x
  3. Step 3: Cross multiply
    12,613.92x = 18,920.88 × 5,217
  4. Step 4: Simplify right side
    12,613.92x = 98,710,230.96
  5. Step 5: Solve for x
    x = 98,710,230.96/12,613.92
  6. Step 6: Final answer
    x = 7,825.50

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Double scale
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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.