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Finding the Fourth Proportional to 30.03, 41.38 and 21.39

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Solution

The fourth proportional to 30.03, 41.38 and 21.39 is: 29.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.03 : 41.38 = 21.39 : x
  2. Step 2: Convert to fraction form
    30.03/41.38 = 21.39/x
  3. Step 3: Cross multiply
    30.03x = 41.38 × 21.39
  4. Step 4: Simplify right side
    30.03x = 885.12
  5. Step 5: Solve for x
    x = 885.12/30.03
  6. Step 6: Final answer
    x = 29.47

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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.