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Finding the Fourth Proportional to 817.17, 1,126.92 and 630.36

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Solution

The fourth proportional to 817.17, 1,126.92 and 630.36 is: 869.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.17 : 1,126.92 = 630.36 : x
  2. Step 2: Convert to fraction form
    817.17/1,126.92 = 630.36/x
  3. Step 3: Cross multiply
    817.17x = 1,126.92 × 630.36
  4. Step 4: Simplify right side
    817.17x = 710,365.29
  5. Step 5: Solve for x
    x = 710,365.29/817.17
  6. Step 6: Final answer
    x = 869.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.