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Finding the Fourth Proportional to 868.64, 1,199.76 and 757.76

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Solution

The fourth proportional to 868.64, 1,199.76 and 757.76 is: 1,046.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.64 : 1,199.76 = 757.76 : x
  2. Step 2: Convert to fraction form
    868.64/1,199.76 = 757.76/x
  3. Step 3: Cross multiply
    868.64x = 1,199.76 × 757.76
  4. Step 4: Simplify right side
    868.64x = 909,130.14
  5. Step 5: Solve for x
    x = 909,130.14/868.64
  6. Step 6: Final answer
    x = 1,046.61

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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.