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Finding the Fourth Proportional to 266.51, 399.87 and 143.39

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Solution

The fourth proportional to 266.51, 399.87 and 143.39 is: 215.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.51 : 399.87 = 143.39 : x
  2. Step 2: Convert to fraction form
    266.51/399.87 = 143.39/x
  3. Step 3: Cross multiply
    266.51x = 399.87 × 143.39
  4. Step 4: Simplify right side
    266.51x = 57,334.64
  5. Step 5: Solve for x
    x = 57,334.64/266.51
  6. Step 6: Final answer
    x = 215.14

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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.