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Finding the Fourth Proportional to 31.20, 46.56 and 30.66

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Solution

The fourth proportional to 31.20, 46.56 and 30.66 is: 45.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.20 : 46.56 = 30.66 : x
  2. Step 2: Convert to fraction form
    31.20/46.56 = 30.66/x
  3. Step 3: Cross multiply
    31.20x = 46.56 × 30.66
  4. Step 4: Simplify right side
    31.20x = 1,427.53
  5. Step 5: Solve for x
    x = 1,427.53/31.20
  6. Step 6: Final answer
    x = 45.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.