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Finding the Fourth Proportional to 800.64, 1,207.68 and 774.72

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Solution

The fourth proportional to 800.64, 1,207.68 and 774.72 is: 1,168.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.64 : 1,207.68 = 774.72 : x
  2. Step 2: Convert to fraction form
    800.64/1,207.68 = 774.72/x
  3. Step 3: Cross multiply
    800.64x = 1,207.68 × 774.72
  4. Step 4: Simplify right side
    800.64x = 935,613.85
  5. Step 5: Solve for x
    x = 935,613.85/800.64
  6. Step 6: Final answer
    x = 1,168.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.