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Finding the Fourth Proportional to 672.32, 1,008.79 and 644.99

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Solution

The fourth proportional to 672.32, 1,008.79 and 644.99 is: 967.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.32 : 1,008.79 = 644.99 : x
  2. Step 2: Convert to fraction form
    672.32/1,008.79 = 644.99/x
  3. Step 3: Cross multiply
    672.32x = 1,008.79 × 644.99
  4. Step 4: Simplify right side
    672.32x = 650,659.46
  5. Step 5: Solve for x
    x = 650,659.46/672.32
  6. Step 6: Final answer
    x = 967.78

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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.