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Finding the Fourth Proportional to 391,390.80, 587,086.20 and 142,040.40

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Solution

The fourth proportional to 391,390.80, 587,086.20 and 142,040.40 is: 213,060.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,390.80 : 587,086.20 = 142,040.40 : x
  2. Step 2: Convert to fraction form
    391,390.80/587,086.20 = 142,040.40/x
  3. Step 3: Cross multiply
    391,390.80x = 587,086.20 × 142,040.40
  4. Step 4: Simplify right side
    391,390.80x = 83,389,958,682.48
  5. Step 5: Solve for x
    x = 83,389,958,682.48/391,390.80
  6. Step 6: Final answer
    x = 213,060.60

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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.