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Finding the Fourth Proportional to 91,304.80, 136,971.92 and 28,124.91

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Solution

The fourth proportional to 91,304.80, 136,971.92 and 28,124.91 is: 42,191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,304.80 : 136,971.92 = 28,124.91 : x
  2. Step 2: Convert to fraction form
    91,304.80/136,971.92 = 28,124.91/x
  3. Step 3: Cross multiply
    91,304.80x = 136,971.92 × 28,124.91
  4. Step 4: Simplify right side
    91,304.80x = 3,852,322,922.53
  5. Step 5: Solve for x
    x = 3,852,322,922.53/91,304.80
  6. Step 6: Final answer
    x = 42,191.90

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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.