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Finding the Fourth Proportional to 106.08, 159.85 and 91.05

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Solution

The fourth proportional to 106.08, 159.85 and 91.05 is: 137.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.08 : 159.85 = 91.05 : x
  2. Step 2: Convert to fraction form
    106.08/159.85 = 91.05/x
  3. Step 3: Cross multiply
    106.08x = 159.85 × 91.05
  4. Step 4: Simplify right side
    106.08x = 14,554.34
  5. Step 5: Solve for x
    x = 14,554.34/106.08
  6. Step 6: Final answer
    x = 137.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.