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Finding the Fourth Proportional to 1,040.97, 1,436.79 and 686.96

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Solution

The fourth proportional to 1,040.97, 1,436.79 and 686.96 is: 948.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.97 : 1,436.79 = 686.96 : x
  2. Step 2: Convert to fraction form
    1,040.97/1,436.79 = 686.96/x
  3. Step 3: Cross multiply
    1,040.97x = 1,436.79 × 686.96
  4. Step 4: Simplify right side
    1,040.97x = 987,010.07
  5. Step 5: Solve for x
    x = 987,010.07/1,040.97
  6. Step 6: Final answer
    x = 948.16

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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.