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Finding the Fourth Proportional to 100,737.76, 138,989.88 and 64,948.72

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Solution

The fourth proportional to 100,737.76, 138,989.88 and 64,948.72 is: 89,611.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,737.76 : 138,989.88 = 64,948.72 : x
  2. Step 2: Convert to fraction form
    100,737.76/138,989.88 = 64,948.72/x
  3. Step 3: Cross multiply
    100,737.76x = 138,989.88 × 64,948.72
  4. Step 4: Simplify right side
    100,737.76x = 9,027,214,798.95
  5. Step 5: Solve for x
    x = 9,027,214,798.95/100,737.76
  6. Step 6: Final answer
    x = 89,611.03

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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.