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Finding the Fourth Proportional to 820.74, 1,231.45 and 492.31

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Solution

The fourth proportional to 820.74, 1,231.45 and 492.31 is: 738.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.74 : 1,231.45 = 492.31 : x
  2. Step 2: Convert to fraction form
    820.74/1,231.45 = 492.31/x
  3. Step 3: Cross multiply
    820.74x = 1,231.45 × 492.31
  4. Step 4: Simplify right side
    820.74x = 606,246.53
  5. Step 5: Solve for x
    x = 606,246.53/820.74
  6. Step 6: Final answer
    x = 738.66

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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.