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Finding the Fourth Proportional to 667.15, 1,000.44 and 319.73

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Solution

The fourth proportional to 667.15, 1,000.44 and 319.73 is: 479.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.15 : 1,000.44 = 319.73 : x
  2. Step 2: Convert to fraction form
    667.15/1,000.44 = 319.73/x
  3. Step 3: Cross multiply
    667.15x = 1,000.44 × 319.73
  4. Step 4: Simplify right side
    667.15x = 319,875.08
  5. Step 5: Solve for x
    x = 319,875.08/667.15
  6. Step 6: Final answer
    x = 479.47

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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.