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Finding the Fourth Proportional to 672.46, 925.90 and 644.78

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Solution

The fourth proportional to 672.46, 925.90 and 644.78 is: 887.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.46 : 925.90 = 644.78 : x
  2. Step 2: Convert to fraction form
    672.46/925.90 = 644.78/x
  3. Step 3: Cross multiply
    672.46x = 925.90 × 644.78
  4. Step 4: Simplify right side
    672.46x = 597,001.80
  5. Step 5: Solve for x
    x = 597,001.80/672.46
  6. Step 6: Final answer
    x = 887.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.