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Finding the Fourth Proportional to 1,281.45, 1,768.28 and 757.38

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Solution

The fourth proportional to 1,281.45, 1,768.28 and 757.38 is: 1,045.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.45 : 1,768.28 = 757.38 : x
  2. Step 2: Convert to fraction form
    1,281.45/1,768.28 = 757.38/x
  3. Step 3: Cross multiply
    1,281.45x = 1,768.28 × 757.38
  4. Step 4: Simplify right side
    1,281.45x = 1,339,256.12
  5. Step 5: Solve for x
    x = 1,339,256.12/1,281.45
  6. Step 6: Final answer
    x = 1,045.11

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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.