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Finding the Fourth Proportional to 143.72, 216.36 and 123.88

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Solution

The fourth proportional to 143.72, 216.36 and 123.88 is: 186.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 216.36 = 123.88 : x
  2. Step 2: Convert to fraction form
    143.72/216.36 = 123.88/x
  3. Step 3: Cross multiply
    143.72x = 216.36 × 123.88
  4. Step 4: Simplify right side
    143.72x = 26,800.98
  5. Step 5: Solve for x
    x = 26,800.98/143.72
  6. Step 6: Final answer
    x = 186.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.