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Finding the Fourth Proportional to 391,109.20, 586,426.20 and 154,178.80

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Solution

The fourth proportional to 391,109.20, 586,426.20 and 154,178.80 is: 231,174.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,109.20 : 586,426.20 = 154,178.80 : x
  2. Step 2: Convert to fraction form
    391,109.20/586,426.20 = 154,178.80/x
  3. Step 3: Cross multiply
    391,109.20x = 586,426.20 × 154,178.80
  4. Step 4: Simplify right side
    391,109.20x = 90,414,487,804.56
  5. Step 5: Solve for x
    x = 90,414,487,804.56/391,109.20
  6. Step 6: Final answer
    x = 231,174.54

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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.