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Finding the Fourth Proportional to 56.88, 85.16 and 54.58

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Solution

The fourth proportional to 56.88, 85.16 and 54.58 is: 81.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.88 : 85.16 = 54.58 : x
  2. Step 2: Convert to fraction form
    56.88/85.16 = 54.58/x
  3. Step 3: Cross multiply
    56.88x = 85.16 × 54.58
  4. Step 4: Simplify right side
    56.88x = 4,647.76
  5. Step 5: Solve for x
    x = 4,647.76/56.88
  6. Step 6: Final answer
    x = 81.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.