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Finding the Fourth Proportional to 30.90, 46.15 and 30.66

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Solution

The fourth proportional to 30.90, 46.15 and 30.66 is: 45.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.90 : 46.15 = 30.66 : x
  2. Step 2: Convert to fraction form
    30.90/46.15 = 30.66/x
  3. Step 3: Cross multiply
    30.90x = 46.15 × 30.66
  4. Step 4: Simplify right side
    30.90x = 1,414.81
  5. Step 5: Solve for x
    x = 1,414.81/30.90
  6. Step 6: Final answer
    x = 45.79

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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.