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Finding the Fourth Proportional to 159.38, 219.88 and 89.42

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Solution

The fourth proportional to 159.38, 219.88 and 89.42 is: 123.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.38 : 219.88 = 89.42 : x
  2. Step 2: Convert to fraction form
    159.38/219.88 = 89.42/x
  3. Step 3: Cross multiply
    159.38x = 219.88 × 89.42
  4. Step 4: Simplify right side
    159.38x = 19,661.51
  5. Step 5: Solve for x
    x = 19,661.51/159.38
  6. Step 6: Final answer
    x = 123.37

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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.