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Finding the Fourth Proportional to 761.20, 1,143.32 and 718.22

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Solution

The fourth proportional to 761.20, 1,143.32 and 718.22 is: 1,078.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.20 : 1,143.32 = 718.22 : x
  2. Step 2: Convert to fraction form
    761.20/1,143.32 = 718.22/x
  3. Step 3: Cross multiply
    761.20x = 1,143.32 × 718.22
  4. Step 4: Simplify right side
    761.20x = 821,148.13
  5. Step 5: Solve for x
    x = 821,148.13/761.20
  6. Step 6: Final answer
    x = 1,078.76

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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.