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Finding the Fourth Proportional to 687.98, 1,037.36 and 630.57

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Solution

The fourth proportional to 687.98, 1,037.36 and 630.57 is: 950.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.98 : 1,037.36 = 630.57 : x
  2. Step 2: Convert to fraction form
    687.98/1,037.36 = 630.57/x
  3. Step 3: Cross multiply
    687.98x = 1,037.36 × 630.57
  4. Step 4: Simplify right side
    687.98x = 654,128.10
  5. Step 5: Solve for x
    x = 654,128.10/687.98
  6. Step 6: Final answer
    x = 950.80

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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.