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Finding the Fourth Proportional to 202.72, 279.69 and 123.99

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Solution

The fourth proportional to 202.72, 279.69 and 123.99 is: 171.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.72 : 279.69 = 123.99 : x
  2. Step 2: Convert to fraction form
    202.72/279.69 = 123.99/x
  3. Step 3: Cross multiply
    202.72x = 279.69 × 123.99
  4. Step 4: Simplify right side
    202.72x = 34,679.35
  5. Step 5: Solve for x
    x = 34,679.35/202.72
  6. Step 6: Final answer
    x = 171.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.