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Finding the Fourth Proportional to 138,511.40, 207,767.10 and 85,749.80

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Solution

The fourth proportional to 138,511.40, 207,767.10 and 85,749.80 is: 128,624.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,511.40 : 207,767.10 = 85,749.80 : x
  2. Step 2: Convert to fraction form
    138,511.40/207,767.10 = 85,749.80/x
  3. Step 3: Cross multiply
    138,511.40x = 207,767.10 × 85,749.80
  4. Step 4: Simplify right side
    138,511.40x = 17,815,987,271.58
  5. Step 5: Solve for x
    x = 17,815,987,271.58/138,511.40
  6. Step 6: Final answer
    x = 128,624.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.