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Finding the Fourth Proportional to 136.95, 189.12 and 87.95

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Solution

The fourth proportional to 136.95, 189.12 and 87.95 is: 121.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.95 : 189.12 = 87.95 : x
  2. Step 2: Convert to fraction form
    136.95/189.12 = 87.95/x
  3. Step 3: Cross multiply
    136.95x = 189.12 × 87.95
  4. Step 4: Simplify right side
    136.95x = 16,632.16
  5. Step 5: Solve for x
    x = 16,632.16/136.95
  6. Step 6: Final answer
    x = 121.45

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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.