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Finding the Fourth Proportional to 8,688.76, 11,981.14 and 8,506.48

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Solution

The fourth proportional to 8,688.76, 11,981.14 and 8,506.48 is: 11,729.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.76 : 11,981.14 = 8,506.48 : x
  2. Step 2: Convert to fraction form
    8,688.76/11,981.14 = 8,506.48/x
  3. Step 3: Cross multiply
    8,688.76x = 11,981.14 × 8,506.48
  4. Step 4: Simplify right side
    8,688.76x = 101,917,327.79
  5. Step 5: Solve for x
    x = 101,917,327.79/8,688.76
  6. Step 6: Final answer
    x = 11,729.79

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.