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Finding the Fourth Proportional to 86,516.73, 129,775.10 and 20,852.73

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Solution

The fourth proportional to 86,516.73, 129,775.10 and 20,852.73 is: 31,279.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,516.73 : 129,775.10 = 20,852.73 : x
  2. Step 2: Convert to fraction form
    86,516.73/129,775.10 = 20,852.73/x
  3. Step 3: Cross multiply
    86,516.73x = 129,775.10 × 20,852.73
  4. Step 4: Simplify right side
    86,516.73x = 2,706,165,016.76
  5. Step 5: Solve for x
    x = 2,706,165,016.76/86,516.73
  6. Step 6: Final answer
    x = 31,279.10

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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.