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Finding the Fourth Proportional to 55.53, 82.11 and 55.38

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Solution

The fourth proportional to 55.53, 82.11 and 55.38 is: 81.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.53 : 82.11 = 55.38 : x
  2. Step 2: Convert to fraction form
    55.53/82.11 = 55.38/x
  3. Step 3: Cross multiply
    55.53x = 82.11 × 55.38
  4. Step 4: Simplify right side
    55.53x = 4,547.25
  5. Step 5: Solve for x
    x = 4,547.25/55.53
  6. Step 6: Final answer
    x = 81.89

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.