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Finding the Fourth Proportional to 330.76, 455.80 and 243.28

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Solution

The fourth proportional to 330.76, 455.80 and 243.28 is: 335.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.76 : 455.80 = 243.28 : x
  2. Step 2: Convert to fraction form
    330.76/455.80 = 243.28/x
  3. Step 3: Cross multiply
    330.76x = 455.80 × 243.28
  4. Step 4: Simplify right side
    330.76x = 110,887.02
  5. Step 5: Solve for x
    x = 110,887.02/330.76
  6. Step 6: Final answer
    x = 335.25

Related Problems

Find fourth proportional to 165.38, 227.90 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.