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Finding the Fourth Proportional to 159.13, 238.78 and 86.00

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Solution

The fourth proportional to 159.13, 238.78 and 86.00 is: 129.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.13 : 238.78 = 86.00 : x
  2. Step 2: Convert to fraction form
    159.13/238.78 = 86.00/x
  3. Step 3: Cross multiply
    159.13x = 238.78 × 86.00
  4. Step 4: Simplify right side
    159.13x = 20,534.79
  5. Step 5: Solve for x
    x = 20,534.79/159.13
  6. Step 6: Final answer
    x = 129.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.