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Finding the Fourth Proportional to 765.74, 1,057.68 and 665.96

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Solution

The fourth proportional to 765.74, 1,057.68 and 665.96 is: 919.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.74 : 1,057.68 = 665.96 : x
  2. Step 2: Convert to fraction form
    765.74/1,057.68 = 665.96/x
  3. Step 3: Cross multiply
    765.74x = 1,057.68 × 665.96
  4. Step 4: Simplify right side
    765.74x = 704,369.16
  5. Step 5: Solve for x
    x = 704,369.16/765.74
  6. Step 6: Final answer
    x = 919.86

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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.