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Finding the Fourth Proportional to 159.92, 220.68 and 89.99

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Solution

The fourth proportional to 159.92, 220.68 and 89.99 is: 124.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.92 : 220.68 = 89.99 : x
  2. Step 2: Convert to fraction form
    159.92/220.68 = 89.99/x
  3. Step 3: Cross multiply
    159.92x = 220.68 × 89.99
  4. Step 4: Simplify right side
    159.92x = 19,858.22
  5. Step 5: Solve for x
    x = 19,858.22/159.92
  6. Step 6: Final answer
    x = 124.18

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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.