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Finding the Fourth Proportional to 820.56, 1,230.78 and 333.48

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Solution

The fourth proportional to 820.56, 1,230.78 and 333.48 is: 500.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.56 : 1,230.78 = 333.48 : x
  2. Step 2: Convert to fraction form
    820.56/1,230.78 = 333.48/x
  3. Step 3: Cross multiply
    820.56x = 1,230.78 × 333.48
  4. Step 4: Simplify right side
    820.56x = 410,440.51
  5. Step 5: Solve for x
    x = 410,440.51/820.56
  6. Step 6: Final answer
    x = 500.20

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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.