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Finding the Fourth Proportional to 391,543.90, 586,718 and 291,218.92

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Solution

The fourth proportional to 391,543.90, 586,718 and 291,218.92 is: 436,383.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,543.90 : 586,718 = 291,218.92 : x
  2. Step 2: Convert to fraction form
    391,543.90/586,718 = 291,218.92/x
  3. Step 3: Cross multiply
    391,543.90x = 586,718 × 291,218.92
  4. Step 4: Simplify right side
    391,543.90x = 170,863,382,304.56
  5. Step 5: Solve for x
    x = 170,863,382,304.56/391,543.90
  6. Step 6: Final answer
    x = 436,383.72

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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.