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Finding the Fourth Proportional to 1,127.81, 1,556.43 and 630.44

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Solution

The fourth proportional to 1,127.81, 1,556.43 and 630.44 is: 870.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.81 : 1,556.43 = 630.44 : x
  2. Step 2: Convert to fraction form
    1,127.81/1,556.43 = 630.44/x
  3. Step 3: Cross multiply
    1,127.81x = 1,556.43 × 630.44
  4. Step 4: Simplify right side
    1,127.81x = 981,235.73
  5. Step 5: Solve for x
    x = 981,235.73/1,127.81
  6. Step 6: Final answer
    x = 870.04

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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.