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Finding the Fourth Proportional to 767.04, 1,057.92 and 711.36

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Solution

The fourth proportional to 767.04, 1,057.92 and 711.36 is: 981.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.04 : 1,057.92 = 711.36 : x
  2. Step 2: Convert to fraction form
    767.04/1,057.92 = 711.36/x
  3. Step 3: Cross multiply
    767.04x = 1,057.92 × 711.36
  4. Step 4: Simplify right side
    767.04x = 752,561.97
  5. Step 5: Solve for x
    x = 752,561.97/767.04
  6. Step 6: Final answer
    x = 981.12

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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.