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Finding the Fourth Proportional to 66.82, 99.85 and 48.45

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Solution

The fourth proportional to 66.82, 99.85 and 48.45 is: 72.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.82 : 99.85 = 48.45 : x
  2. Step 2: Convert to fraction form
    66.82/99.85 = 48.45/x
  3. Step 3: Cross multiply
    66.82x = 99.85 × 48.45
  4. Step 4: Simplify right side
    66.82x = 4,837.73
  5. Step 5: Solve for x
    x = 4,837.73/66.82
  6. Step 6: Final answer
    x = 72.40

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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.