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Finding the Fourth Proportional to 330.76, 456.42 and 243.28

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Solution

The fourth proportional to 330.76, 456.42 and 243.28 is: 335.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.76 : 456.42 = 243.28 : x
  2. Step 2: Convert to fraction form
    330.76/456.42 = 243.28/x
  3. Step 3: Cross multiply
    330.76x = 456.42 × 243.28
  4. Step 4: Simplify right side
    330.76x = 111,037.86
  5. Step 5: Solve for x
    x = 111,037.86/330.76
  6. Step 6: Final answer
    x = 335.71

Related Problems

Find fourth proportional to 165.38, 228.21 and 121.64
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Double scale
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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.