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Finding the Fourth Proportional to 159.93, 220.72 and 89.99

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Solution

The fourth proportional to 159.93, 220.72 and 89.99 is: 124.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.93 : 220.72 = 89.99 : x
  2. Step 2: Convert to fraction form
    159.93/220.72 = 89.99/x
  3. Step 3: Cross multiply
    159.93x = 220.72 × 89.99
  4. Step 4: Simplify right side
    159.93x = 19,863.37
  5. Step 5: Solve for x
    x = 19,863.37/159.93
  6. Step 6: Final answer
    x = 124.20

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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.