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Finding the Fourth Proportional to 687.96, 1,037.07 and 660.15

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Solution

The fourth proportional to 687.96, 1,037.07 and 660.15 is: 995.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.96 : 1,037.07 = 660.15 : x
  2. Step 2: Convert to fraction form
    687.96/1,037.07 = 660.15/x
  3. Step 3: Cross multiply
    687.96x = 1,037.07 × 660.15
  4. Step 4: Simplify right side
    687.96x = 684,621.76
  5. Step 5: Solve for x
    x = 684,621.76/687.96
  6. Step 6: Final answer
    x = 995.15

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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.