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Finding the Fourth Proportional to 91,908, 137,860.92 and 47,621.52

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Solution

The fourth proportional to 91,908, 137,860.92 and 47,621.52 is: 71,431.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,908 : 137,860.92 = 47,621.52 : x
  2. Step 2: Convert to fraction form
    91,908/137,860.92 = 47,621.52/x
  3. Step 3: Cross multiply
    91,908x = 137,860.92 × 47,621.52
  4. Step 4: Simplify right side
    91,908x = 6,565,146,559.00
  5. Step 5: Solve for x
    x = 6,565,146,559.00/91,908
  6. Step 6: Final answer
    x = 71,431.72

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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.