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Finding the Fourth Proportional to 696.29, 1,039.79 and 655.79

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Solution

The fourth proportional to 696.29, 1,039.79 and 655.79 is: 979.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.29 : 1,039.79 = 655.79 : x
  2. Step 2: Convert to fraction form
    696.29/1,039.79 = 655.79/x
  3. Step 3: Cross multiply
    696.29x = 1,039.79 × 655.79
  4. Step 4: Simplify right side
    696.29x = 681,880.32
  5. Step 5: Solve for x
    x = 681,880.32/696.29
  6. Step 6: Final answer
    x = 979.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.