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Finding the Fourth Proportional to 55.77, 76.91 and 39.39

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Solution

The fourth proportional to 55.77, 76.91 and 39.39 is: 54.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.77 : 76.91 = 39.39 : x
  2. Step 2: Convert to fraction form
    55.77/76.91 = 39.39/x
  3. Step 3: Cross multiply
    55.77x = 76.91 × 39.39
  4. Step 4: Simplify right side
    55.77x = 3,029.29
  5. Step 5: Solve for x
    x = 3,029.29/55.77
  6. Step 6: Final answer
    x = 54.32

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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.