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Finding the Fourth Proportional to 391,211.80, 587,012.10 and 154,562.20

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Solution

The fourth proportional to 391,211.80, 587,012.10 and 154,562.20 is: 231,920.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,211.80 : 587,012.10 = 154,562.20 : x
  2. Step 2: Convert to fraction form
    391,211.80/587,012.10 = 154,562.20/x
  3. Step 3: Cross multiply
    391,211.80x = 587,012.10 × 154,562.20
  4. Step 4: Simplify right side
    391,211.80x = 90,729,881,602.62
  5. Step 5: Solve for x
    x = 90,729,881,602.62/391,211.80
  6. Step 6: Final answer
    x = 231,920.10

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1.5x scale

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.