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Finding the Fourth Proportional to 1,127.79, 1,556.36 and 630.40

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Solution

The fourth proportional to 1,127.79, 1,556.36 and 630.40 is: 869.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.79 : 1,556.36 = 630.40 : x
  2. Step 2: Convert to fraction form
    1,127.79/1,556.36 = 630.40/x
  3. Step 3: Cross multiply
    1,127.79x = 1,556.36 × 630.40
  4. Step 4: Simplify right side
    1,127.79x = 981,129.34
  5. Step 5: Solve for x
    x = 981,129.34/1,127.79
  6. Step 6: Final answer
    x = 869.96

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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.