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Finding the Fourth Proportional to 99,915.44, 137,944.80 and 64,168.45

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Solution

The fourth proportional to 99,915.44, 137,944.80 and 64,168.45 is: 88,591.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,915.44 : 137,944.80 = 64,168.45 : x
  2. Step 2: Convert to fraction form
    99,915.44/137,944.80 = 64,168.45/x
  3. Step 3: Cross multiply
    99,915.44x = 137,944.80 × 64,168.45
  4. Step 4: Simplify right side
    99,915.44x = 8,851,704,001.56
  5. Step 5: Solve for x
    x = 8,851,704,001.56/99,915.44
  6. Step 6: Final answer
    x = 88,591.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.