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Finding the Fourth Proportional to 81.16, 112.01 and 46.66

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Solution

The fourth proportional to 81.16, 112.01 and 46.66 is: 64.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.16 : 112.01 = 46.66 : x
  2. Step 2: Convert to fraction form
    81.16/112.01 = 46.66/x
  3. Step 3: Cross multiply
    81.16x = 112.01 × 46.66
  4. Step 4: Simplify right side
    81.16x = 5,226.39
  5. Step 5: Solve for x
    x = 5,226.39/81.16
  6. Step 6: Final answer
    x = 64.40

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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.