Home / 90,989.40-125,601.42-78,191.76

Finding the Fourth Proportional to 90,989.40, 125,601.42 and 78,191.76

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Solution

The fourth proportional to 90,989.40, 125,601.42 and 78,191.76 is: 107,935.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,989.40 : 125,601.42 = 78,191.76 : x
  2. Step 2: Convert to fraction form
    90,989.40/125,601.42 = 78,191.76/x
  3. Step 3: Cross multiply
    90,989.40x = 125,601.42 × 78,191.76
  4. Step 4: Simplify right side
    90,989.40x = 9,820,996,088.30
  5. Step 5: Solve for x
    x = 9,820,996,088.30/90,989.40
  6. Step 6: Final answer
    x = 107,935.61

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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.