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Finding the Fourth Proportional to 92,407.70, 138,611.55 and 86,575.70

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Solution

The fourth proportional to 92,407.70, 138,611.55 and 86,575.70 is: 129,863.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,407.70 : 138,611.55 = 86,575.70 : x
  2. Step 2: Convert to fraction form
    92,407.70/138,611.55 = 86,575.70/x
  3. Step 3: Cross multiply
    92,407.70x = 138,611.55 × 86,575.70
  4. Step 4: Simplify right side
    92,407.70x = 12,000,391,969.34
  5. Step 5: Solve for x
    x = 12,000,391,969.34/92,407.70
  6. Step 6: Final answer
    x = 129,863.55

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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.