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Finding the Fourth Proportional to 99,138.80, 148,621.80 and 59,711.60

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Solution

The fourth proportional to 99,138.80, 148,621.80 and 59,711.60 is: 89,515.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,138.80 : 148,621.80 = 59,711.60 : x
  2. Step 2: Convert to fraction form
    99,138.80/148,621.80 = 59,711.60/x
  3. Step 3: Cross multiply
    99,138.80x = 148,621.80 × 59,711.60
  4. Step 4: Simplify right side
    99,138.80x = 8,874,445,472.88
  5. Step 5: Solve for x
    x = 8,874,445,472.88/99,138.80
  6. Step 6: Final answer
    x = 89,515.36

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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.