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Finding the Fourth Proportional to 391,212.80, 587,013.60 and 154,563.20

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Solution

The fourth proportional to 391,212.80, 587,013.60 and 154,563.20 is: 231,921.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,212.80 : 587,013.60 = 154,563.20 : x
  2. Step 2: Convert to fraction form
    391,212.80/587,013.60 = 154,563.20/x
  3. Step 3: Cross multiply
    391,212.80x = 587,013.60 × 154,563.20
  4. Step 4: Simplify right side
    391,212.80x = 90,730,700,459.52
  5. Step 5: Solve for x
    x = 90,730,700,459.52/391,212.80
  6. Step 6: Final answer
    x = 231,921.60

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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.