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Finding the Fourth Proportional to 1,281.68, 1,768.64 and 757.70

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Solution

The fourth proportional to 1,281.68, 1,768.64 and 757.70 is: 1,045.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.68 : 1,768.64 = 757.70 : x
  2. Step 2: Convert to fraction form
    1,281.68/1,768.64 = 757.70/x
  3. Step 3: Cross multiply
    1,281.68x = 1,768.64 × 757.70
  4. Step 4: Simplify right side
    1,281.68x = 1,340,098.53
  5. Step 5: Solve for x
    x = 1,340,098.53/1,281.68
  6. Step 6: Final answer
    x = 1,045.58

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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.