Home / 90,711.62-125,138.49-78,114.50

Finding the Fourth Proportional to 90,711.62, 125,138.49 and 78,114.50

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Solution

The fourth proportional to 90,711.62, 125,138.49 and 78,114.50 is: 107,760.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,711.62 : 125,138.49 = 78,114.50 : x
  2. Step 2: Convert to fraction form
    90,711.62/125,138.49 = 78,114.50/x
  3. Step 3: Cross multiply
    90,711.62x = 125,138.49 × 78,114.50
  4. Step 4: Simplify right side
    90,711.62x = 9,775,130,577.11
  5. Step 5: Solve for x
    x = 9,775,130,577.11/90,711.62
  6. Step 6: Final answer
    x = 107,760.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.