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Finding the Fourth Proportional to 391,780.80, 587,671.20 and 251,812.80

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Solution

The fourth proportional to 391,780.80, 587,671.20 and 251,812.80 is: 377,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,780.80 : 587,671.20 = 251,812.80 : x
  2. Step 2: Convert to fraction form
    391,780.80/587,671.20 = 251,812.80/x
  3. Step 3: Cross multiply
    391,780.80x = 587,671.20 × 251,812.80
  4. Step 4: Simplify right side
    391,780.80x = 147,983,130,351.36
  5. Step 5: Solve for x
    x = 147,983,130,351.36/391,780.80
  6. Step 6: Final answer
    x = 377,719.20

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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.