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Finding the Fourth Proportional to 391,407.80, 587,111.70 and 251,439.80

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Solution

The fourth proportional to 391,407.80, 587,111.70 and 251,439.80 is: 377,159.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,407.80 : 587,111.70 = 251,439.80 : x
  2. Step 2: Convert to fraction form
    391,407.80/587,111.70 = 251,439.80/x
  3. Step 3: Cross multiply
    391,407.80x = 587,111.70 × 251,439.80
  4. Step 4: Simplify right side
    391,407.80x = 147,623,248,425.66
  5. Step 5: Solve for x
    x = 147,623,248,425.66/391,407.80
  6. Step 6: Final answer
    x = 377,159.70

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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.