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Finding the Fourth Proportional to 45.29, 68.18 and 31.86

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Solution

The fourth proportional to 45.29, 68.18 and 31.86 is: 47.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.29 : 68.18 = 31.86 : x
  2. Step 2: Convert to fraction form
    45.29/68.18 = 31.86/x
  3. Step 3: Cross multiply
    45.29x = 68.18 × 31.86
  4. Step 4: Simplify right side
    45.29x = 2,172.06
  5. Step 5: Solve for x
    x = 2,172.06/45.29
  6. Step 6: Final answer
    x = 47.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.