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Finding the Fourth Proportional to 201.80, 278.53 and 123.15

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Solution

The fourth proportional to 201.80, 278.53 and 123.15 is: 169.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.80 : 278.53 = 123.15 : x
  2. Step 2: Convert to fraction form
    201.80/278.53 = 123.15/x
  3. Step 3: Cross multiply
    201.80x = 278.53 × 123.15
  4. Step 4: Simplify right side
    201.80x = 34,301.71
  5. Step 5: Solve for x
    x = 34,301.71/201.80
  6. Step 6: Final answer
    x = 169.98

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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.