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Finding the Fourth Proportional to 667.06, 999.21 and 392.31

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Solution

The fourth proportional to 667.06, 999.21 and 392.31 is: 587.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.06 : 999.21 = 392.31 : x
  2. Step 2: Convert to fraction form
    667.06/999.21 = 392.31/x
  3. Step 3: Cross multiply
    667.06x = 999.21 × 392.31
  4. Step 4: Simplify right side
    667.06x = 392,000.08
  5. Step 5: Solve for x
    x = 392,000.08/667.06
  6. Step 6: Final answer
    x = 587.65

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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.