Home / 100,139.12-138,138.72-61,920.08

Finding the Fourth Proportional to 100,139.12, 138,138.72 and 61,920.08

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Solution

The fourth proportional to 100,139.12, 138,138.72 and 61,920.08 is: 85,416.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,139.12 : 138,138.72 = 61,920.08 : x
  2. Step 2: Convert to fraction form
    100,139.12/138,138.72 = 61,920.08/x
  3. Step 3: Cross multiply
    100,139.12x = 138,138.72 × 61,920.08
  4. Step 4: Simplify right side
    100,139.12x = 8,553,560,593.50
  5. Step 5: Solve for x
    x = 8,553,560,593.50/100,139.12
  6. Step 6: Final answer
    x = 85,416.77

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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.