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Finding the Fourth Proportional to 159.35, 219.91 and 89.40

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Solution

The fourth proportional to 159.35, 219.91 and 89.40 is: 123.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.35 : 219.91 = 89.40 : x
  2. Step 2: Convert to fraction form
    159.35/219.91 = 89.40/x
  3. Step 3: Cross multiply
    159.35x = 219.91 × 89.40
  4. Step 4: Simplify right side
    159.35x = 19,659.95
  5. Step 5: Solve for x
    x = 19,659.95/159.35
  6. Step 6: Final answer
    x = 123.38

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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.