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Finding the Fourth Proportional to 90,890.97, 136,398.74 and 31,726.65

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Solution

The fourth proportional to 90,890.97, 136,398.74 and 31,726.65 is: 47,611.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,890.97 : 136,398.74 = 31,726.65 : x
  2. Step 2: Convert to fraction form
    90,890.97/136,398.74 = 31,726.65/x
  3. Step 3: Cross multiply
    90,890.97x = 136,398.74 × 31,726.65
  4. Step 4: Simplify right side
    90,890.97x = 4,327,475,084.42
  5. Step 5: Solve for x
    x = 4,327,475,084.42/90,890.97
  6. Step 6: Final answer
    x = 47,611.72

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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.