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Finding the Fourth Proportional to 72.20, 99.66 and 48.92

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Solution

The fourth proportional to 72.20, 99.66 and 48.92 is: 67.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.20 : 99.66 = 48.92 : x
  2. Step 2: Convert to fraction form
    72.20/99.66 = 48.92/x
  3. Step 3: Cross multiply
    72.20x = 99.66 × 48.92
  4. Step 4: Simplify right side
    72.20x = 4,875.05
  5. Step 5: Solve for x
    x = 4,875.05/72.20
  6. Step 6: Final answer
    x = 67.52

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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.