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Finding the Fourth Proportional to 756.18, 1,042.20 and 718.38

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Solution

The fourth proportional to 756.18, 1,042.20 and 718.38 is: 990.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.18 : 1,042.20 = 718.38 : x
  2. Step 2: Convert to fraction form
    756.18/1,042.20 = 718.38/x
  3. Step 3: Cross multiply
    756.18x = 1,042.20 × 718.38
  4. Step 4: Simplify right side
    756.18x = 748,695.64
  5. Step 5: Solve for x
    x = 748,695.64/756.18
  6. Step 6: Final answer
    x = 990.10

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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.