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Finding the Fourth Proportional to 802.67, 1,204.34 and 391.81

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Solution

The fourth proportional to 802.67, 1,204.34 and 391.81 is: 587.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.67 : 1,204.34 = 391.81 : x
  2. Step 2: Convert to fraction form
    802.67/1,204.34 = 391.81/x
  3. Step 3: Cross multiply
    802.67x = 1,204.34 × 391.81
  4. Step 4: Simplify right side
    802.67x = 471,872.46
  5. Step 5: Solve for x
    x = 471,872.46/802.67
  6. Step 6: Final answer
    x = 587.88

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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.