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Finding the Fourth Proportional to 55.75, 76.93 and 31.19

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Solution

The fourth proportional to 55.75, 76.93 and 31.19 is: 43.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.75 : 76.93 = 31.19 : x
  2. Step 2: Convert to fraction form
    55.75/76.93 = 31.19/x
  3. Step 3: Cross multiply
    55.75x = 76.93 × 31.19
  4. Step 4: Simplify right side
    55.75x = 2,399.45
  5. Step 5: Solve for x
    x = 2,399.45/55.75
  6. Step 6: Final answer
    x = 43.04

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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.