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Finding the Fourth Proportional to 115.51, 159.26 and 87.83

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Solution

The fourth proportional to 115.51, 159.26 and 87.83 is: 121.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.51 : 159.26 = 87.83 : x
  2. Step 2: Convert to fraction form
    115.51/159.26 = 87.83/x
  3. Step 3: Cross multiply
    115.51x = 159.26 × 87.83
  4. Step 4: Simplify right side
    115.51x = 13,987.23
  5. Step 5: Solve for x
    x = 13,987.23/115.51
  6. Step 6: Final answer
    x = 121.09

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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.