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Finding the Fourth Proportional to 391,298.58, 539,994.06 and 221,565.78

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Solution

The fourth proportional to 391,298.58, 539,994.06 and 221,565.78 is: 305,761.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,298.58 : 539,994.06 = 221,565.78 : x
  2. Step 2: Convert to fraction form
    391,298.58/539,994.06 = 221,565.78/x
  3. Step 3: Cross multiply
    391,298.58x = 539,994.06 × 221,565.78
  4. Step 4: Simplify right side
    391,298.58x = 119,644,205,099.27
  5. Step 5: Solve for x
    x = 119,644,205,099.27/391,298.58
  6. Step 6: Final answer
    x = 305,761.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.