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Finding the Fourth Proportional to 87,154.60, 130,731.90 and 42,809.80

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Solution

The fourth proportional to 87,154.60, 130,731.90 and 42,809.80 is: 64,214.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,154.60 : 130,731.90 = 42,809.80 : x
  2. Step 2: Convert to fraction form
    87,154.60/130,731.90 = 42,809.80/x
  3. Step 3: Cross multiply
    87,154.60x = 130,731.90 × 42,809.80
  4. Step 4: Simplify right side
    87,154.60x = 5,596,606,492.62
  5. Step 5: Solve for x
    x = 5,596,606,492.62/87,154.60
  6. Step 6: Final answer
    x = 64,214.70

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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.