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Finding the Fourth Proportional to 100,041.28, 138,059.69 and 54,721.93

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Solution

The fourth proportional to 100,041.28, 138,059.69 and 54,721.93 is: 75,517.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,041.28 : 138,059.69 = 54,721.93 : x
  2. Step 2: Convert to fraction form
    100,041.28/138,059.69 = 54,721.93/x
  3. Step 3: Cross multiply
    100,041.28x = 138,059.69 × 54,721.93
  4. Step 4: Simplify right side
    100,041.28x = 7,554,892,639.92
  5. Step 5: Solve for x
    x = 7,554,892,639.92/100,041.28
  6. Step 6: Final answer
    x = 75,517.75

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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.