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Finding the Fourth Proportional to 314.76, 434.16 and 231.78

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Solution

The fourth proportional to 314.76, 434.16 and 231.78 is: 319.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.76 : 434.16 = 231.78 : x
  2. Step 2: Convert to fraction form
    314.76/434.16 = 231.78/x
  3. Step 3: Cross multiply
    314.76x = 434.16 × 231.78
  4. Step 4: Simplify right side
    314.76x = 100,629.60
  5. Step 5: Solve for x
    x = 100,629.60/314.76
  6. Step 6: Final answer
    x = 319.70

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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.