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Finding the Fourth Proportional to 492,939.35, 680,287.81 and 278,000.99

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Solution

The fourth proportional to 492,939.35, 680,287.81 and 278,000.99 is: 383,659.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,939.35 : 680,287.81 = 278,000.99 : x
  2. Step 2: Convert to fraction form
    492,939.35/680,287.81 = 278,000.99/x
  3. Step 3: Cross multiply
    492,939.35x = 680,287.81 × 278,000.99
  4. Step 4: Simplify right side
    492,939.35x = 189,120,684,472.79
  5. Step 5: Solve for x
    x = 189,120,684,472.79/492,939.35
  6. Step 6: Final answer
    x = 383,659.13

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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.