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Finding the Fourth Proportional to 391,815.60, 587,720.88 and 189,175.20

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Solution

The fourth proportional to 391,815.60, 587,720.88 and 189,175.20 is: 283,761.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,815.60 : 587,720.88 = 189,175.20 : x
  2. Step 2: Convert to fraction form
    391,815.60/587,720.88 = 189,175.20/x
  3. Step 3: Cross multiply
    391,815.60x = 587,720.88 × 189,175.20
  4. Step 4: Simplify right side
    391,815.60x = 111,182,215,018.18
  5. Step 5: Solve for x
    x = 111,182,215,018.18/391,815.60
  6. Step 6: Final answer
    x = 283,761.58

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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.