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Finding the Fourth Proportional to 201.98, 278.70 and 123.25

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Solution

The fourth proportional to 201.98, 278.70 and 123.25 is: 170.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.98 : 278.70 = 123.25 : x
  2. Step 2: Convert to fraction form
    201.98/278.70 = 123.25/x
  3. Step 3: Cross multiply
    201.98x = 278.70 × 123.25
  4. Step 4: Simplify right side
    201.98x = 34,349.16
  5. Step 5: Solve for x
    x = 34,349.16/201.98
  6. Step 6: Final answer
    x = 170.07

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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.