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Finding the Fourth Proportional to 64.91, 89.77 and 54.72

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Solution

The fourth proportional to 64.91, 89.77 and 54.72 is: 75.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.91 : 89.77 = 54.72 : x
  2. Step 2: Convert to fraction form
    64.91/89.77 = 54.72/x
  3. Step 3: Cross multiply
    64.91x = 89.77 × 54.72
  4. Step 4: Simplify right side
    64.91x = 4,912.21
  5. Step 5: Solve for x
    x = 4,912.21/64.91
  6. Step 6: Final answer
    x = 75.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.