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Finding the Fourth Proportional to 391,330.02, 587,258.13 and 138,609.66

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Solution

The fourth proportional to 391,330.02, 587,258.13 and 138,609.66 is: 208,007.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,330.02 : 587,258.13 = 138,609.66 : x
  2. Step 2: Convert to fraction form
    391,330.02/587,258.13 = 138,609.66/x
  3. Step 3: Cross multiply
    391,330.02x = 587,258.13 × 138,609.66
  4. Step 4: Simplify right side
    391,330.02x = 81,399,649,731.54
  5. Step 5: Solve for x
    x = 81,399,649,731.54/391,330.02
  6. Step 6: Final answer
    x = 208,007.68

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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.