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Finding the Fourth Proportional to 680,081.30, 938,474.61 and 378,255.86

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Solution

The fourth proportional to 680,081.30, 938,474.61 and 378,255.86 is: 521,972.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,081.30 : 938,474.61 = 378,255.86 : x
  2. Step 2: Convert to fraction form
    680,081.30/938,474.61 = 378,255.86/x
  3. Step 3: Cross multiply
    680,081.30x = 938,474.61 × 378,255.86
  4. Step 4: Simplify right side
    680,081.30x = 354,983,520,693.72
  5. Step 5: Solve for x
    x = 354,983,520,693.72/680,081.30
  6. Step 6: Final answer
    x = 521,972.18

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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.