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Finding the Fourth Proportional to 696.54, 1,036.85 and 686.16

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Solution

The fourth proportional to 696.54, 1,036.85 and 686.16 is: 1,021.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.54 : 1,036.85 = 686.16 : x
  2. Step 2: Convert to fraction form
    696.54/1,036.85 = 686.16/x
  3. Step 3: Cross multiply
    696.54x = 1,036.85 × 686.16
  4. Step 4: Simplify right side
    696.54x = 711,436.38
  5. Step 5: Solve for x
    x = 711,436.38/696.54
  6. Step 6: Final answer
    x = 1,021.39

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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.