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Finding the Fourth Proportional to 1,127.56, 1,555.89 and 630.13

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Solution

The fourth proportional to 1,127.56, 1,555.89 and 630.13 is: 869.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.56 : 1,555.89 = 630.13 : x
  2. Step 2: Convert to fraction form
    1,127.56/1,555.89 = 630.13/x
  3. Step 3: Cross multiply
    1,127.56x = 1,555.89 × 630.13
  4. Step 4: Simplify right side
    1,127.56x = 980,412.97
  5. Step 5: Solve for x
    x = 980,412.97/1,127.56
  6. Step 6: Final answer
    x = 869.50

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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.