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Finding the Fourth Proportional to 158.09, 236.59 and 128.86

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Solution

The fourth proportional to 158.09, 236.59 and 128.86 is: 192.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.09 : 236.59 = 128.86 : x
  2. Step 2: Convert to fraction form
    158.09/236.59 = 128.86/x
  3. Step 3: Cross multiply
    158.09x = 236.59 × 128.86
  4. Step 4: Simplify right side
    158.09x = 30,486.07
  5. Step 5: Solve for x
    x = 30,486.07/158.09
  6. Step 6: Final answer
    x = 192.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.