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Finding the Fourth Proportional to 666.40, 999.04 and 281.40

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Solution

The fourth proportional to 666.40, 999.04 and 281.40 is: 421.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.40 : 999.04 = 281.40 : x
  2. Step 2: Convert to fraction form
    666.40/999.04 = 281.40/x
  3. Step 3: Cross multiply
    666.40x = 999.04 × 281.40
  4. Step 4: Simplify right side
    666.40x = 281,129.86
  5. Step 5: Solve for x
    x = 281,129.86/666.40
  6. Step 6: Final answer
    x = 421.86

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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.