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Finding the Fourth Proportional to 668.88, 1,003.68 and 666.72

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Solution

The fourth proportional to 668.88, 1,003.68 and 666.72 is: 1,000.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.88 : 1,003.68 = 666.72 : x
  2. Step 2: Convert to fraction form
    668.88/1,003.68 = 666.72/x
  3. Step 3: Cross multiply
    668.88x = 1,003.68 × 666.72
  4. Step 4: Simplify right side
    668.88x = 669,173.53
  5. Step 5: Solve for x
    x = 669,173.53/668.88
  6. Step 6: Final answer
    x = 1,000.44

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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.