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Finding the Fourth Proportional to 115.51, 159.42 and 86.35

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Solution

The fourth proportional to 115.51, 159.42 and 86.35 is: 119.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.51 : 159.42 = 86.35 : x
  2. Step 2: Convert to fraction form
    115.51/159.42 = 86.35/x
  3. Step 3: Cross multiply
    115.51x = 159.42 × 86.35
  4. Step 4: Simplify right side
    115.51x = 13,765.49
  5. Step 5: Solve for x
    x = 13,765.49/115.51
  6. Step 6: Final answer
    x = 119.17

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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.