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Finding the Fourth Proportional to 56.96, 79.08 and 55.54

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Solution

The fourth proportional to 56.96, 79.08 and 55.54 is: 77.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.96 : 79.08 = 55.54 : x
  2. Step 2: Convert to fraction form
    56.96/79.08 = 55.54/x
  3. Step 3: Cross multiply
    56.96x = 79.08 × 55.54
  4. Step 4: Simplify right side
    56.96x = 4,392.10
  5. Step 5: Solve for x
    x = 4,392.10/56.96
  6. Step 6: Final answer
    x = 77.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.