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Finding the Fourth Proportional to 55.40, 83.05 and 39.38

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Solution

The fourth proportional to 55.40, 83.05 and 39.38 is: 59.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.40 : 83.05 = 39.38 : x
  2. Step 2: Convert to fraction form
    55.40/83.05 = 39.38/x
  3. Step 3: Cross multiply
    55.40x = 83.05 × 39.38
  4. Step 4: Simplify right side
    55.40x = 3,270.51
  5. Step 5: Solve for x
    x = 3,270.51/55.40
  6. Step 6: Final answer
    x = 59.03

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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.