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Finding the Fourth Proportional to 55.96, 76.85 and 47.80

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Solution

The fourth proportional to 55.96, 76.85 and 47.80 is: 65.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.96 : 76.85 = 47.80 : x
  2. Step 2: Convert to fraction form
    55.96/76.85 = 47.80/x
  3. Step 3: Cross multiply
    55.96x = 76.85 × 47.80
  4. Step 4: Simplify right side
    55.96x = 3,673.43
  5. Step 5: Solve for x
    x = 3,673.43/55.96
  6. Step 6: Final answer
    x = 65.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.