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Finding the Fourth Proportional to 391,912.25, 586,871.23 and 258,387.39

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Solution

The fourth proportional to 391,912.25, 586,871.23 and 258,387.39 is: 386,923.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,912.25 : 586,871.23 = 258,387.39 : x
  2. Step 2: Convert to fraction form
    391,912.25/586,871.23 = 258,387.39/x
  3. Step 3: Cross multiply
    391,912.25x = 586,871.23 × 258,387.39
  4. Step 4: Simplify right side
    391,912.25x = 151,640,125,385.79
  5. Step 5: Solve for x
    x = 151,640,125,385.79/391,912.25
  6. Step 6: Final answer
    x = 386,923.67

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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.