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Finding the Fourth Proportional to 64.92, 96.99 and 48.72

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Solution

The fourth proportional to 64.92, 96.99 and 48.72 is: 72.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.92 : 96.99 = 48.72 : x
  2. Step 2: Convert to fraction form
    64.92/96.99 = 48.72/x
  3. Step 3: Cross multiply
    64.92x = 96.99 × 48.72
  4. Step 4: Simplify right side
    64.92x = 4,725.35
  5. Step 5: Solve for x
    x = 4,725.35/64.92
  6. Step 6: Final answer
    x = 72.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.