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Finding the Fourth Proportional to 802.85, 1,204.07 and 315.91

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Solution

The fourth proportional to 802.85, 1,204.07 and 315.91 is: 473.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.85 : 1,204.07 = 315.91 : x
  2. Step 2: Convert to fraction form
    802.85/1,204.07 = 315.91/x
  3. Step 3: Cross multiply
    802.85x = 1,204.07 × 315.91
  4. Step 4: Simplify right side
    802.85x = 380,371.73
  5. Step 5: Solve for x
    x = 380,371.73/802.85
  6. Step 6: Final answer
    x = 473.78

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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.