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Finding the Fourth Proportional to 801.79, 1,201.97 and 390.85

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Solution

The fourth proportional to 801.79, 1,201.97 and 390.85 is: 585.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.79 : 1,201.97 = 390.85 : x
  2. Step 2: Convert to fraction form
    801.79/1,201.97 = 390.85/x
  3. Step 3: Cross multiply
    801.79x = 1,201.97 × 390.85
  4. Step 4: Simplify right side
    801.79x = 469,787.95
  5. Step 5: Solve for x
    x = 469,787.95/801.79
  6. Step 6: Final answer
    x = 585.93

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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.