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Finding the Fourth Proportional to 202.15, 278.88 and 123.49

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Solution

The fourth proportional to 202.15, 278.88 and 123.49 is: 170.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.15 : 278.88 = 123.49 : x
  2. Step 2: Convert to fraction form
    202.15/278.88 = 123.49/x
  3. Step 3: Cross multiply
    202.15x = 278.88 × 123.49
  4. Step 4: Simplify right side
    202.15x = 34,438.89
  5. Step 5: Solve for x
    x = 34,438.89/202.15
  6. Step 6: Final answer
    x = 170.36

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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.