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Finding the Fourth Proportional to 154.40, 212.57 and 134.98

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Solution

The fourth proportional to 154.40, 212.57 and 134.98 is: 185.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.40 : 212.57 = 134.98 : x
  2. Step 2: Convert to fraction form
    154.40/212.57 = 134.98/x
  3. Step 3: Cross multiply
    154.40x = 212.57 × 134.98
  4. Step 4: Simplify right side
    154.40x = 28,692.02
  5. Step 5: Solve for x
    x = 28,692.02/154.40
  6. Step 6: Final answer
    x = 185.83

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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.