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Finding the Fourth Proportional to 91,809.70, 137,714.55 and 87,921.70

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Solution

The fourth proportional to 91,809.70, 137,714.55 and 87,921.70 is: 131,882.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,809.70 : 137,714.55 = 87,921.70 : x
  2. Step 2: Convert to fraction form
    91,809.70/137,714.55 = 87,921.70/x
  3. Step 3: Cross multiply
    91,809.70x = 137,714.55 × 87,921.70
  4. Step 4: Simplify right side
    91,809.70x = 12,108,097,350.74
  5. Step 5: Solve for x
    x = 12,108,097,350.74/91,809.70
  6. Step 6: Final answer
    x = 131,882.55

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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.