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Finding the Fourth Proportional to 56.15, 84.72 and 54.29

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Solution

The fourth proportional to 56.15, 84.72 and 54.29 is: 81.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.15 : 84.72 = 54.29 : x
  2. Step 2: Convert to fraction form
    56.15/84.72 = 54.29/x
  3. Step 3: Cross multiply
    56.15x = 84.72 × 54.29
  4. Step 4: Simplify right side
    56.15x = 4,599.03
  5. Step 5: Solve for x
    x = 4,599.03/56.15
  6. Step 6: Final answer
    x = 81.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.