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Finding the Fourth Proportional to 76.52, 105.51 and 55.77

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Solution

The fourth proportional to 76.52, 105.51 and 55.77 is: 76.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.52 : 105.51 = 55.77 : x
  2. Step 2: Convert to fraction form
    76.52/105.51 = 55.77/x
  3. Step 3: Cross multiply
    76.52x = 105.51 × 55.77
  4. Step 4: Simplify right side
    76.52x = 5,884.29
  5. Step 5: Solve for x
    x = 5,884.29/76.52
  6. Step 6: Final answer
    x = 76.90

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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.