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Finding the Fourth Proportional to 1,127.75, 1,556.17 and 630.34

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Solution

The fourth proportional to 1,127.75, 1,556.17 and 630.34 is: 869.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.75 : 1,556.17 = 630.34 : x
  2. Step 2: Convert to fraction form
    1,127.75/1,556.17 = 630.34/x
  3. Step 3: Cross multiply
    1,127.75x = 1,556.17 × 630.34
  4. Step 4: Simplify right side
    1,127.75x = 980,910.73
  5. Step 5: Solve for x
    x = 980,910.73/1,127.75
  6. Step 6: Final answer
    x = 869.80

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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.