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Finding the Fourth Proportional to 154.05, 212.57 and 88.56

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Solution

The fourth proportional to 154.05, 212.57 and 88.56 is: 122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.05 : 212.57 = 88.56 : x
  2. Step 2: Convert to fraction form
    154.05/212.57 = 88.56/x
  3. Step 3: Cross multiply
    154.05x = 212.57 × 88.56
  4. Step 4: Simplify right side
    154.05x = 18,824.84
  5. Step 5: Solve for x
    x = 18,824.84/154.05
  6. Step 6: Final answer
    x = 122.20

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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.