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Finding the Fourth Proportional to 817.28, 1,127.07 and 630.47

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Solution

The fourth proportional to 817.28, 1,127.07 and 630.47 is: 869.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.28 : 1,127.07 = 630.47 : x
  2. Step 2: Convert to fraction form
    817.28/1,127.07 = 630.47/x
  3. Step 3: Cross multiply
    817.28x = 1,127.07 × 630.47
  4. Step 4: Simplify right side
    817.28x = 710,583.82
  5. Step 5: Solve for x
    x = 710,583.82/817.28
  6. Step 6: Final answer
    x = 869.45

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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.