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Finding the Fourth Proportional to 869.48, 1,310.19 and 718.79

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Solution

The fourth proportional to 869.48, 1,310.19 and 718.79 is: 1,083.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.48 : 1,310.19 = 718.79 : x
  2. Step 2: Convert to fraction form
    869.48/1,310.19 = 718.79/x
  3. Step 3: Cross multiply
    869.48x = 1,310.19 × 718.79
  4. Step 4: Simplify right side
    869.48x = 941,753.64
  5. Step 5: Solve for x
    x = 941,753.64/869.48
  6. Step 6: Final answer
    x = 1,083.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.