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Finding the Fourth Proportional to 135.80, 187.89 and 115.01

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Solution

The fourth proportional to 135.80, 187.89 and 115.01 is: 159.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.80 : 187.89 = 115.01 : x
  2. Step 2: Convert to fraction form
    135.80/187.89 = 115.01/x
  3. Step 3: Cross multiply
    135.80x = 187.89 × 115.01
  4. Step 4: Simplify right side
    135.80x = 21,609.23
  5. Step 5: Solve for x
    x = 21,609.23/135.80
  6. Step 6: Final answer
    x = 159.13

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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.