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Finding the Fourth Proportional to 765.45, 1,057.46 and 707.13

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Solution

The fourth proportional to 765.45, 1,057.46 and 707.13 is: 976.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,057.46 = 707.13 : x
  2. Step 2: Convert to fraction form
    765.45/1,057.46 = 707.13/x
  3. Step 3: Cross multiply
    765.45x = 1,057.46 × 707.13
  4. Step 4: Simplify right side
    765.45x = 747,758.15
  5. Step 5: Solve for x
    x = 747,758.15/765.45
  6. Step 6: Final answer
    x = 976.89

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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.