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Finding the Fourth Proportional to 840.38, 1,260.39 and 292.55

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Solution

The fourth proportional to 840.38, 1,260.39 and 292.55 is: 438.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.38 : 1,260.39 = 292.55 : x
  2. Step 2: Convert to fraction form
    840.38/1,260.39 = 292.55/x
  3. Step 3: Cross multiply
    840.38x = 1,260.39 × 292.55
  4. Step 4: Simplify right side
    840.38x = 368,721.89
  5. Step 5: Solve for x
    x = 368,721.89/840.38
  6. Step 6: Final answer
    x = 438.76

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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.