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Finding the Fourth Proportional to 87,310.40, 130,879.20 and 42,900.80

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Solution

The fourth proportional to 87,310.40, 130,879.20 and 42,900.80 is: 64,308.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,310.40 : 130,879.20 = 42,900.80 : x
  2. Step 2: Convert to fraction form
    87,310.40/130,879.20 = 42,900.80/x
  3. Step 3: Cross multiply
    87,310.40x = 130,879.20 × 42,900.80
  4. Step 4: Simplify right side
    87,310.40x = 5,614,822,383.36
  5. Step 5: Solve for x
    x = 5,614,822,383.36/87,310.40
  6. Step 6: Final answer
    x = 64,308.75

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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.