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Finding the Fourth Proportional to 100,239.62, 138,330.59 and 54,920.42

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Solution

The fourth proportional to 100,239.62, 138,330.59 and 54,920.42 is: 75,790.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,239.62 : 138,330.59 = 54,920.42 : x
  2. Step 2: Convert to fraction form
    100,239.62/138,330.59 = 54,920.42/x
  3. Step 3: Cross multiply
    100,239.62x = 138,330.59 × 54,920.42
  4. Step 4: Simplify right side
    100,239.62x = 7,597,173,135.39
  5. Step 5: Solve for x
    x = 7,597,173,135.39/100,239.62
  6. Step 6: Final answer
    x = 75,790.13

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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.