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Finding the Fourth Proportional to 45.39, 68.10 and 21.36

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Solution

The fourth proportional to 45.39, 68.10 and 21.36 is: 32.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.39 : 68.10 = 21.36 : x
  2. Step 2: Convert to fraction form
    45.39/68.10 = 21.36/x
  3. Step 3: Cross multiply
    45.39x = 68.10 × 21.36
  4. Step 4: Simplify right side
    45.39x = 1,454.62
  5. Step 5: Solve for x
    x = 1,454.62/45.39
  6. Step 6: Final answer
    x = 32.05

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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.