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Finding the Fourth Proportional to 1,132.78, 1,696.43 and 644.35

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Solution

The fourth proportional to 1,132.78, 1,696.43 and 644.35 is: 964.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.78 : 1,696.43 = 644.35 : x
  2. Step 2: Convert to fraction form
    1,132.78/1,696.43 = 644.35/x
  3. Step 3: Cross multiply
    1,132.78x = 1,696.43 × 644.35
  4. Step 4: Simplify right side
    1,132.78x = 1,093,082.97
  5. Step 5: Solve for x
    x = 1,093,082.97/1,132.78
  6. Step 6: Final answer
    x = 964.96

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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.