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Finding the Fourth Proportional to 266.72, 399.87 and 84.00

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Solution

The fourth proportional to 266.72, 399.87 and 84.00 is: 125.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.72 : 399.87 = 84.00 : x
  2. Step 2: Convert to fraction form
    266.72/399.87 = 84.00/x
  3. Step 3: Cross multiply
    266.72x = 399.87 × 84.00
  4. Step 4: Simplify right side
    266.72x = 33,590.58
  5. Step 5: Solve for x
    x = 33,590.58/266.72
  6. Step 6: Final answer
    x = 125.94

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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.