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Finding the Fourth Proportional to 672.05, 1,005.67 and 487.17

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Solution

The fourth proportional to 672.05, 1,005.67 and 487.17 is: 729.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.05 : 1,005.67 = 487.17 : x
  2. Step 2: Convert to fraction form
    672.05/1,005.67 = 487.17/x
  3. Step 3: Cross multiply
    672.05x = 1,005.67 × 487.17
  4. Step 4: Simplify right side
    672.05x = 489,932.86
  5. Step 5: Solve for x
    x = 489,932.86/672.05
  6. Step 6: Final answer
    x = 729.01

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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.