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Finding the Fourth Proportional to 666.85, 999.82 and 342.49

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Solution

The fourth proportional to 666.85, 999.82 and 342.49 is: 513.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.85 : 999.82 = 342.49 : x
  2. Step 2: Convert to fraction form
    666.85/999.82 = 342.49/x
  3. Step 3: Cross multiply
    666.85x = 999.82 × 342.49
  4. Step 4: Simplify right side
    666.85x = 342,428.35
  5. Step 5: Solve for x
    x = 342,428.35/666.85
  6. Step 6: Final answer
    x = 513.50

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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.