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Finding the Fourth Proportional to 55.84, 83.76 and 21.61

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Solution

The fourth proportional to 55.84, 83.76 and 21.61 is: 32.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.84 : 83.76 = 21.61 : x
  2. Step 2: Convert to fraction form
    55.84/83.76 = 21.61/x
  3. Step 3: Cross multiply
    55.84x = 83.76 × 21.61
  4. Step 4: Simplify right side
    55.84x = 1,810.05
  5. Step 5: Solve for x
    x = 1,810.05/55.84
  6. Step 6: Final answer
    x = 32.42

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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.