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Finding the Fourth Proportional to 666.01, 999.15 and 391.96

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Solution

The fourth proportional to 666.01, 999.15 and 391.96 is: 588.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.01 : 999.15 = 391.96 : x
  2. Step 2: Convert to fraction form
    666.01/999.15 = 391.96/x
  3. Step 3: Cross multiply
    666.01x = 999.15 × 391.96
  4. Step 4: Simplify right side
    666.01x = 391,626.83
  5. Step 5: Solve for x
    x = 391,626.83/666.01
  6. Step 6: Final answer
    x = 588.02

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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.