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Finding the Fourth Proportional to 92,121.66, 138,148.47 and 72,438.66

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Solution

The fourth proportional to 92,121.66, 138,148.47 and 72,438.66 is: 108,631.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,121.66 : 138,148.47 = 72,438.66 : x
  2. Step 2: Convert to fraction form
    92,121.66/138,148.47 = 72,438.66/x
  3. Step 3: Cross multiply
    92,121.66x = 138,148.47 × 72,438.66
  4. Step 4: Simplify right side
    92,121.66x = 10,007,290,047.85
  5. Step 5: Solve for x
    x = 10,007,290,047.85/92,121.66
  6. Step 6: Final answer
    x = 108,631.24

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1.5x scale

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.