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Finding the Fourth Proportional to 312.35, 468.56 and 81.24

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Solution

The fourth proportional to 312.35, 468.56 and 81.24 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.35 : 468.56 = 81.24 : x
  2. Step 2: Convert to fraction form
    312.35/468.56 = 81.24/x
  3. Step 3: Cross multiply
    312.35x = 468.56 × 81.24
  4. Step 4: Simplify right side
    312.35x = 38,066.67
  5. Step 5: Solve for x
    x = 38,066.67/312.35
  6. Step 6: Final answer
    x = 121.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.