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Finding the Fourth Proportional to 138,642.40, 191,275.20 and 90,922.24

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Solution

The fourth proportional to 138,642.40, 191,275.20 and 90,922.24 is: 125,439.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,642.40 : 191,275.20 = 90,922.24 : x
  2. Step 2: Convert to fraction form
    138,642.40/191,275.20 = 90,922.24/x
  3. Step 3: Cross multiply
    138,642.40x = 191,275.20 × 90,922.24
  4. Step 4: Simplify right side
    138,642.40x = 17,391,169,640.45
  5. Step 5: Solve for x
    x = 17,391,169,640.45/138,642.40
  6. Step 6: Final answer
    x = 125,439.04

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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.