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Finding the Fourth Proportional to 671.04, 1,000.80 and 638.64

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Solution

The fourth proportional to 671.04, 1,000.80 and 638.64 is: 952.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.04 : 1,000.80 = 638.64 : x
  2. Step 2: Convert to fraction form
    671.04/1,000.80 = 638.64/x
  3. Step 3: Cross multiply
    671.04x = 1,000.80 × 638.64
  4. Step 4: Simplify right side
    671.04x = 639,150.91
  5. Step 5: Solve for x
    x = 639,150.91/671.04
  6. Step 6: Final answer
    x = 952.48

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1.5x scale

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.