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Finding the Fourth Proportional to 158.91, 219.23 and 89.91

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Solution

The fourth proportional to 158.91, 219.23 and 89.91 is: 124.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.91 : 219.23 = 89.91 : x
  2. Step 2: Convert to fraction form
    158.91/219.23 = 89.91/x
  3. Step 3: Cross multiply
    158.91x = 219.23 × 89.91
  4. Step 4: Simplify right side
    158.91x = 19,709.87
  5. Step 5: Solve for x
    x = 19,709.87/158.91
  6. Step 6: Final answer
    x = 124.04

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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.