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Finding the Fourth Proportional to 391,138.58, 539,678.73 and 221,372.71

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Solution

The fourth proportional to 391,138.58, 539,678.73 and 221,372.71 is: 305,441.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,138.58 : 539,678.73 = 221,372.71 : x
  2. Step 2: Convert to fraction form
    391,138.58/539,678.73 = 221,372.71/x
  3. Step 3: Cross multiply
    391,138.58x = 539,678.73 × 221,372.71
  4. Step 4: Simplify right side
    391,138.58x = 119,470,142,470.41
  5. Step 5: Solve for x
    x = 119,470,142,470.41/391,138.58
  6. Step 6: Final answer
    x = 305,441.98

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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.