Home / 87,139.78-130,675.11-45,621.70

Finding the Fourth Proportional to 87,139.78, 130,675.11 and 45,621.70

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Solution

The fourth proportional to 87,139.78, 130,675.11 and 45,621.70 is: 68,414.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,139.78 : 130,675.11 = 45,621.70 : x
  2. Step 2: Convert to fraction form
    87,139.78/130,675.11 = 45,621.70/x
  3. Step 3: Cross multiply
    87,139.78x = 130,675.11 × 45,621.70
  4. Step 4: Simplify right side
    87,139.78x = 5,961,620,665.89
  5. Step 5: Solve for x
    x = 5,961,620,665.89/87,139.78
  6. Step 6: Final answer
    x = 68,414.46

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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.