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Finding the Fourth Proportional to 696.88, 1,037.36 and 686.50

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Solution

The fourth proportional to 696.88, 1,037.36 and 686.50 is: 1,021.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.88 : 1,037.36 = 686.50 : x
  2. Step 2: Convert to fraction form
    696.88/1,037.36 = 686.50/x
  3. Step 3: Cross multiply
    696.88x = 1,037.36 × 686.50
  4. Step 4: Simplify right side
    696.88x = 712,144.83
  5. Step 5: Solve for x
    x = 712,144.83/696.88
  6. Step 6: Final answer
    x = 1,021.90

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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.