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Finding the Fourth Proportional to 981.10, 1,352.73 and 718.66

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Solution

The fourth proportional to 981.10, 1,352.73 and 718.66 is: 990.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.10 : 1,352.73 = 718.66 : x
  2. Step 2: Convert to fraction form
    981.10/1,352.73 = 718.66/x
  3. Step 3: Cross multiply
    981.10x = 1,352.73 × 718.66
  4. Step 4: Simplify right side
    981.10x = 972,152.94
  5. Step 5: Solve for x
    x = 972,152.94/981.10
  6. Step 6: Final answer
    x = 990.88

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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.