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Finding the Fourth Proportional to 138,498.66, 207,860.58 and 78,565.14

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Solution

The fourth proportional to 138,498.66, 207,860.58 and 78,565.14 is: 117,911.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,498.66 : 207,860.58 = 78,565.14 : x
  2. Step 2: Convert to fraction form
    138,498.66/207,860.58 = 78,565.14/x
  3. Step 3: Cross multiply
    138,498.66x = 207,860.58 × 78,565.14
  4. Step 4: Simplify right side
    138,498.66x = 16,330,595,568.18
  5. Step 5: Solve for x
    x = 16,330,595,568.18/138,498.66
  6. Step 6: Final answer
    x = 117,911.58

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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.