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Finding the Fourth Proportional to 56.05, 76.87 and 53.80

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Solution

The fourth proportional to 56.05, 76.87 and 53.80 is: 73.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.05 : 76.87 = 53.80 : x
  2. Step 2: Convert to fraction form
    56.05/76.87 = 53.80/x
  3. Step 3: Cross multiply
    56.05x = 76.87 × 53.80
  4. Step 4: Simplify right side
    56.05x = 4,135.61
  5. Step 5: Solve for x
    x = 4,135.61/56.05
  6. Step 6: Final answer
    x = 73.78

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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.