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Finding the Fourth Proportional to 820.65, 1,230.98 and 243.53

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Solution

The fourth proportional to 820.65, 1,230.98 and 243.53 is: 365.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.65 : 1,230.98 = 243.53 : x
  2. Step 2: Convert to fraction form
    820.65/1,230.98 = 243.53/x
  3. Step 3: Cross multiply
    820.65x = 1,230.98 × 243.53
  4. Step 4: Simplify right side
    820.65x = 299,775.65
  5. Step 5: Solve for x
    x = 299,775.65/820.65
  6. Step 6: Final answer
    x = 365.29

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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.