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Finding the Fourth Proportional to 92,615.80, 138,528.06 and 77,325.40

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Solution

The fourth proportional to 92,615.80, 138,528.06 and 77,325.40 is: 115,657.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,615.80 : 138,528.06 = 77,325.40 : x
  2. Step 2: Convert to fraction form
    92,615.80/138,528.06 = 77,325.40/x
  3. Step 3: Cross multiply
    92,615.80x = 138,528.06 × 77,325.40
  4. Step 4: Simplify right side
    92,615.80x = 10,711,737,650.72
  5. Step 5: Solve for x
    x = 10,711,737,650.72/92,615.80
  6. Step 6: Final answer
    x = 115,657.78

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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.