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Finding the Fourth Proportional to 30.78, 46.21 and 19.33

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Solution

The fourth proportional to 30.78, 46.21 and 19.33 is: 29.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.78 : 46.21 = 19.33 : x
  2. Step 2: Convert to fraction form
    30.78/46.21 = 19.33/x
  3. Step 3: Cross multiply
    30.78x = 46.21 × 19.33
  4. Step 4: Simplify right side
    30.78x = 893.30
  5. Step 5: Solve for x
    x = 893.30/30.78
  6. Step 6: Final answer
    x = 29.02

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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.