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Finding the Fourth Proportional to 773.70, 1,159.20 and 665.70

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Solution

The fourth proportional to 773.70, 1,159.20 and 665.70 is: 997.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.70 : 1,159.20 = 665.70 : x
  2. Step 2: Convert to fraction form
    773.70/1,159.20 = 665.70/x
  3. Step 3: Cross multiply
    773.70x = 1,159.20 × 665.70
  4. Step 4: Simplify right side
    773.70x = 771,679.44
  5. Step 5: Solve for x
    x = 771,679.44/773.70
  6. Step 6: Final answer
    x = 997.39

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1.5x scale

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.