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Finding the Fourth Proportional to 391,291.06, 586,720.30 and 121,344.34

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Solution

The fourth proportional to 391,291.06, 586,720.30 and 121,344.34 is: 181,949.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,291.06 : 586,720.30 = 121,344.34 : x
  2. Step 2: Convert to fraction form
    391,291.06/586,720.30 = 121,344.34/x
  3. Step 3: Cross multiply
    391,291.06x = 586,720.30 × 121,344.34
  4. Step 4: Simplify right side
    391,291.06x = 71,195,187,568.10
  5. Step 5: Solve for x
    x = 71,195,187,568.10/391,291.06
  6. Step 6: Final answer
    x = 181,949.44

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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.