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Finding the Fourth Proportional to 314.58, 434.24 and 281.78

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Solution

The fourth proportional to 314.58, 434.24 and 281.78 is: 388.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.58 : 434.24 = 281.78 : x
  2. Step 2: Convert to fraction form
    314.58/434.24 = 281.78/x
  3. Step 3: Cross multiply
    314.58x = 434.24 × 281.78
  4. Step 4: Simplify right side
    314.58x = 122,360.15
  5. Step 5: Solve for x
    x = 122,360.15/314.58
  6. Step 6: Final answer
    x = 388.96

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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.