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Finding the Fourth Proportional to 92,213.80, 138,320.70 and 87,402.40

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Solution

The fourth proportional to 92,213.80, 138,320.70 and 87,402.40 is: 131,103.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,213.80 : 138,320.70 = 87,402.40 : x
  2. Step 2: Convert to fraction form
    92,213.80/138,320.70 = 87,402.40/x
  3. Step 3: Cross multiply
    92,213.80x = 138,320.70 × 87,402.40
  4. Step 4: Simplify right side
    92,213.80x = 12,089,561,149.68
  5. Step 5: Solve for x
    x = 12,089,561,149.68/92,213.80
  6. Step 6: Final answer
    x = 131,103.60

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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.