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Finding the Fourth Proportional to 671.72, 1,000.54 and 663.32

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Solution

The fourth proportional to 671.72, 1,000.54 and 663.32 is: 988.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.72 : 1,000.54 = 663.32 : x
  2. Step 2: Convert to fraction form
    671.72/1,000.54 = 663.32/x
  3. Step 3: Cross multiply
    671.72x = 1,000.54 × 663.32
  4. Step 4: Simplify right side
    671.72x = 663,678.19
  5. Step 5: Solve for x
    x = 663,678.19/671.72
  6. Step 6: Final answer
    x = 988.03

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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.