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Finding the Fourth Proportional to 154.20, 231.21 and 56.66

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Solution

The fourth proportional to 154.20, 231.21 and 56.66 is: 84.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.20 : 231.21 = 56.66 : x
  2. Step 2: Convert to fraction form
    154.20/231.21 = 56.66/x
  3. Step 3: Cross multiply
    154.20x = 231.21 × 56.66
  4. Step 4: Simplify right side
    154.20x = 13,100.36
  5. Step 5: Solve for x
    x = 13,100.36/154.20
  6. Step 6: Final answer
    x = 84.96

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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.