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Finding the Fourth Proportional to 672.70, 927.82 and 486.81

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Solution

The fourth proportional to 672.70, 927.82 and 486.81 is: 671.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.70 : 927.82 = 486.81 : x
  2. Step 2: Convert to fraction form
    672.70/927.82 = 486.81/x
  3. Step 3: Cross multiply
    672.70x = 927.82 × 486.81
  4. Step 4: Simplify right side
    672.70x = 451,672.05
  5. Step 5: Solve for x
    x = 451,672.05/672.70
  6. Step 6: Final answer
    x = 671.43

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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.