Home / 109,105.28-149,912.80-86,710.40

Finding the Fourth Proportional to 109,105.28, 149,912.80 and 86,710.40

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Solution

The fourth proportional to 109,105.28, 149,912.80 and 86,710.40 is: 119,141.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,105.28 : 149,912.80 = 86,710.40 : x
  2. Step 2: Convert to fraction form
    109,105.28/149,912.80 = 86,710.40/x
  3. Step 3: Cross multiply
    109,105.28x = 149,912.80 × 86,710.40
  4. Step 4: Simplify right side
    109,105.28x = 12,998,998,853.12
  5. Step 5: Solve for x
    x = 12,998,998,853.12/109,105.28
  6. Step 6: Final answer
    x = 119,141.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.