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Finding the Fourth Proportional to 55.81, 76.95 and 40.29

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Solution

The fourth proportional to 55.81, 76.95 and 40.29 is: 55.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.81 : 76.95 = 40.29 : x
  2. Step 2: Convert to fraction form
    55.81/76.95 = 40.29/x
  3. Step 3: Cross multiply
    55.81x = 76.95 × 40.29
  4. Step 4: Simplify right side
    55.81x = 3,100.03
  5. Step 5: Solve for x
    x = 3,100.03/55.81
  6. Step 6: Final answer
    x = 55.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.