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Finding the Fourth Proportional to 55.30, 82.96 and 21.06

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Solution

The fourth proportional to 55.30, 82.96 and 21.06 is: 31.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.30 : 82.96 = 21.06 : x
  2. Step 2: Convert to fraction form
    55.30/82.96 = 21.06/x
  3. Step 3: Cross multiply
    55.30x = 82.96 × 21.06
  4. Step 4: Simplify right side
    55.30x = 1,747.08
  5. Step 5: Solve for x
    x = 1,747.08/55.30
  6. Step 6: Final answer
    x = 31.59

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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.