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Finding the Fourth Proportional to 64.54, 96.80 and 53.77

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Solution

The fourth proportional to 64.54, 96.80 and 53.77 is: 80.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.54 : 96.80 = 53.77 : x
  2. Step 2: Convert to fraction form
    64.54/96.80 = 53.77/x
  3. Step 3: Cross multiply
    64.54x = 96.80 × 53.77
  4. Step 4: Simplify right side
    64.54x = 5,204.61
  5. Step 5: Solve for x
    x = 5,204.61/64.54
  6. Step 6: Final answer
    x = 80.65

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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.