Home / 90,711.54-125,243.01-81,121.68

Finding the Fourth Proportional to 90,711.54, 125,243.01 and 81,121.68

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Solution

The fourth proportional to 90,711.54, 125,243.01 and 81,121.68 is: 112,002.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,711.54 : 125,243.01 = 81,121.68 : x
  2. Step 2: Convert to fraction form
    90,711.54/125,243.01 = 81,121.68/x
  3. Step 3: Cross multiply
    90,711.54x = 125,243.01 × 81,121.68
  4. Step 4: Simplify right side
    90,711.54x = 10,159,923,379.46
  5. Step 5: Solve for x
    x = 10,159,923,379.46/90,711.54
  6. Step 6: Final answer
    x = 112,002.55

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1.5x scale

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.