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Finding the Fourth Proportional to 765.76, 1,057.12 and 716.64

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Solution

The fourth proportional to 765.76, 1,057.12 and 716.64 is: 989.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.76 : 1,057.12 = 716.64 : x
  2. Step 2: Convert to fraction form
    765.76/1,057.12 = 716.64/x
  3. Step 3: Cross multiply
    765.76x = 1,057.12 × 716.64
  4. Step 4: Simplify right side
    765.76x = 757,574.48
  5. Step 5: Solve for x
    x = 757,574.48/765.76
  6. Step 6: Final answer
    x = 989.31

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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.