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Finding the Fourth Proportional to 1,034.72, 1,553.10 and 669.80

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Solution

The fourth proportional to 1,034.72, 1,553.10 and 669.80 is: 1,005.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.72 : 1,553.10 = 669.80 : x
  2. Step 2: Convert to fraction form
    1,034.72/1,553.10 = 669.80/x
  3. Step 3: Cross multiply
    1,034.72x = 1,553.10 × 669.80
  4. Step 4: Simplify right side
    1,034.72x = 1,040,266.38
  5. Step 5: Solve for x
    x = 1,040,266.38/1,034.72
  6. Step 6: Final answer
    x = 1,005.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.