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Finding the Fourth Proportional to 765.29, 1,145.49 and 648.65

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Solution

The fourth proportional to 765.29, 1,145.49 and 648.65 is: 970.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.29 : 1,145.49 = 648.65 : x
  2. Step 2: Convert to fraction form
    765.29/1,145.49 = 648.65/x
  3. Step 3: Cross multiply
    765.29x = 1,145.49 × 648.65
  4. Step 4: Simplify right side
    765.29x = 743,016.36
  5. Step 5: Solve for x
    x = 743,016.36/765.29
  6. Step 6: Final answer
    x = 970.90

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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.