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Finding the Fourth Proportional to 839.89, 1,260.33 and 292.45

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Solution

The fourth proportional to 839.89, 1,260.33 and 292.45 is: 438.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.89 : 1,260.33 = 292.45 : x
  2. Step 2: Convert to fraction form
    839.89/1,260.33 = 292.45/x
  3. Step 3: Cross multiply
    839.89x = 1,260.33 × 292.45
  4. Step 4: Simplify right side
    839.89x = 368,587.64
  5. Step 5: Solve for x
    x = 368,587.64/839.89
  6. Step 6: Final answer
    x = 438.85

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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.