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Finding the Fourth Proportional to 821.28, 1,232.10 and 334.38

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Solution

The fourth proportional to 821.28, 1,232.10 and 334.38 is: 501.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.28 : 1,232.10 = 334.38 : x
  2. Step 2: Convert to fraction form
    821.28/1,232.10 = 334.38/x
  3. Step 3: Cross multiply
    821.28x = 1,232.10 × 334.38
  4. Step 4: Simplify right side
    821.28x = 411,989.60
  5. Step 5: Solve for x
    x = 411,989.60/821.28
  6. Step 6: Final answer
    x = 501.64

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1.5x scale

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.