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Finding the Fourth Proportional to 391,331.02, 587,259.63 and 138,610.66

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Solution

The fourth proportional to 391,331.02, 587,259.63 and 138,610.66 is: 208,009.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,331.02 : 587,259.63 = 138,610.66 : x
  2. Step 2: Convert to fraction form
    391,331.02/587,259.63 = 138,610.66/x
  3. Step 3: Cross multiply
    391,331.02x = 587,259.63 × 138,610.66
  4. Step 4: Simplify right side
    391,331.02x = 81,400,444,905.66
  5. Step 5: Solve for x
    x = 81,400,444,905.66/391,331.02
  6. Step 6: Final answer
    x = 208,009.18

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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.