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Finding the Fourth Proportional to 59.72, 89.40 and 54.74

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Solution

The fourth proportional to 59.72, 89.40 and 54.74 is: 81.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.72 : 89.40 = 54.74 : x
  2. Step 2: Convert to fraction form
    59.72/89.40 = 54.74/x
  3. Step 3: Cross multiply
    59.72x = 89.40 × 54.74
  4. Step 4: Simplify right side
    59.72x = 4,893.76
  5. Step 5: Solve for x
    x = 4,893.76/59.72
  6. Step 6: Final answer
    x = 81.95

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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.