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Finding the Fourth Proportional to 801.76, 1,202.24 and 390.92

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Solution

The fourth proportional to 801.76, 1,202.24 and 390.92 is: 586.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.76 : 1,202.24 = 390.92 : x
  2. Step 2: Convert to fraction form
    801.76/1,202.24 = 390.92/x
  3. Step 3: Cross multiply
    801.76x = 1,202.24 × 390.92
  4. Step 4: Simplify right side
    801.76x = 469,979.66
  5. Step 5: Solve for x
    x = 469,979.66/801.76
  6. Step 6: Final answer
    x = 586.18

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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.