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Finding the Fourth Proportional to 56.12, 76.86 and 54.32

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Solution

The fourth proportional to 56.12, 76.86 and 54.32 is: 74.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.12 : 76.86 = 54.32 : x
  2. Step 2: Convert to fraction form
    56.12/76.86 = 54.32/x
  3. Step 3: Cross multiply
    56.12x = 76.86 × 54.32
  4. Step 4: Simplify right side
    56.12x = 4,175.04
  5. Step 5: Solve for x
    x = 4,175.04/56.12
  6. Step 6: Final answer
    x = 74.39

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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.