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Finding the Fourth Proportional to 839.86, 1,260.25 and 292.43

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Solution

The fourth proportional to 839.86, 1,260.25 and 292.43 is: 438.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.86 : 1,260.25 = 292.43 : x
  2. Step 2: Convert to fraction form
    839.86/1,260.25 = 292.43/x
  3. Step 3: Cross multiply
    839.86x = 1,260.25 × 292.43
  4. Step 4: Simplify right side
    839.86x = 368,534.91
  5. Step 5: Solve for x
    x = 368,534.91/839.86
  6. Step 6: Final answer
    x = 438.81

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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.