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Finding the Fourth Proportional to 765.12, 1,147.44 and 714

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Solution

The fourth proportional to 765.12, 1,147.44 and 714 is: 1,070.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.12 : 1,147.44 = 714 : x
  2. Step 2: Convert to fraction form
    765.12/1,147.44 = 714/x
  3. Step 3: Cross multiply
    765.12x = 1,147.44 × 714
  4. Step 4: Simplify right side
    765.12x = 819,272.16
  5. Step 5: Solve for x
    x = 819,272.16/765.12
  6. Step 6: Final answer
    x = 1,070.78

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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.