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Finding the Fourth Proportional to 45.88, 68.79 and 21.48

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Solution

The fourth proportional to 45.88, 68.79 and 21.48 is: 32.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.88 : 68.79 = 21.48 : x
  2. Step 2: Convert to fraction form
    45.88/68.79 = 21.48/x
  3. Step 3: Cross multiply
    45.88x = 68.79 × 21.48
  4. Step 4: Simplify right side
    45.88x = 1,477.61
  5. Step 5: Solve for x
    x = 1,477.61/45.88
  6. Step 6: Final answer
    x = 32.21

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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.