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Finding the Fourth Proportional to 159.09, 219.49 and 100.86

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Solution

The fourth proportional to 159.09, 219.49 and 100.86 is: 139.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.09 : 219.49 = 100.86 : x
  2. Step 2: Convert to fraction form
    159.09/219.49 = 100.86/x
  3. Step 3: Cross multiply
    159.09x = 219.49 × 100.86
  4. Step 4: Simplify right side
    159.09x = 22,137.76
  5. Step 5: Solve for x
    x = 22,137.76/159.09
  6. Step 6: Final answer
    x = 139.15

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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.