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Finding the Fourth Proportional to 1,127.88, 1,556.47 and 630.52

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Solution

The fourth proportional to 1,127.88, 1,556.47 and 630.52 is: 870.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.88 : 1,556.47 = 630.52 : x
  2. Step 2: Convert to fraction form
    1,127.88/1,556.47 = 630.52/x
  3. Step 3: Cross multiply
    1,127.88x = 1,556.47 × 630.52
  4. Step 4: Simplify right side
    1,127.88x = 981,385.46
  5. Step 5: Solve for x
    x = 981,385.46/1,127.88
  6. Step 6: Final answer
    x = 870.12

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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.