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Finding the Fourth Proportional to 668.96, 1,002 and 661.58

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Solution

The fourth proportional to 668.96, 1,002 and 661.58 is: 990.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.96 : 1,002 = 661.58 : x
  2. Step 2: Convert to fraction form
    668.96/1,002 = 661.58/x
  3. Step 3: Cross multiply
    668.96x = 1,002 × 661.58
  4. Step 4: Simplify right side
    668.96x = 662,903.16
  5. Step 5: Solve for x
    x = 662,903.16/668.96
  6. Step 6: Final answer
    x = 990.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.