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Finding the Fourth Proportional to 35.39, 48.83 and 21.58

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Solution

The fourth proportional to 35.39, 48.83 and 21.58 is: 29.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.39 : 48.83 = 21.58 : x
  2. Step 2: Convert to fraction form
    35.39/48.83 = 21.58/x
  3. Step 3: Cross multiply
    35.39x = 48.83 × 21.58
  4. Step 4: Simplify right side
    35.39x = 1,053.75
  5. Step 5: Solve for x
    x = 1,053.75/35.39
  6. Step 6: Final answer
    x = 29.78

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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.