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Finding the Fourth Proportional to 152.11, 210 and 108.49

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Solution

The fourth proportional to 152.11, 210 and 108.49 is: 149.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.11 : 210 = 108.49 : x
  2. Step 2: Convert to fraction form
    152.11/210 = 108.49/x
  3. Step 3: Cross multiply
    152.11x = 210 × 108.49
  4. Step 4: Simplify right side
    152.11x = 22,782.90
  5. Step 5: Solve for x
    x = 22,782.90/152.11
  6. Step 6: Final answer
    x = 149.78

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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.