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Finding the Fourth Proportional to 45.52, 68.34 and 21.16

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Solution

The fourth proportional to 45.52, 68.34 and 21.16 is: 31.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.52 : 68.34 = 21.16 : x
  2. Step 2: Convert to fraction form
    45.52/68.34 = 21.16/x
  3. Step 3: Cross multiply
    45.52x = 68.34 × 21.16
  4. Step 4: Simplify right side
    45.52x = 1,446.07
  5. Step 5: Solve for x
    x = 1,446.07/45.52
  6. Step 6: Final answer
    x = 31.77

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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.