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Finding the Fourth Proportional to 159.47, 238.75 and 105.20

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Solution

The fourth proportional to 159.47, 238.75 and 105.20 is: 157.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.47 : 238.75 = 105.20 : x
  2. Step 2: Convert to fraction form
    159.47/238.75 = 105.20/x
  3. Step 3: Cross multiply
    159.47x = 238.75 × 105.20
  4. Step 4: Simplify right side
    159.47x = 25,116.50
  5. Step 5: Solve for x
    x = 25,116.50/159.47
  6. Step 6: Final answer
    x = 157.50

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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.