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Finding the Fourth Proportional to 87,238.59, 130,857.89 and 28,078.89

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Solution

The fourth proportional to 87,238.59, 130,857.89 and 28,078.89 is: 42,118.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,238.59 : 130,857.89 = 28,078.89 : x
  2. Step 2: Convert to fraction form
    87,238.59/130,857.89 = 28,078.89/x
  3. Step 3: Cross multiply
    87,238.59x = 130,857.89 × 28,078.89
  4. Step 4: Simplify right side
    87,238.59x = 3,674,344,298.94
  5. Step 5: Solve for x
    x = 3,674,344,298.94/87,238.59
  6. Step 6: Final answer
    x = 42,118.34

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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.