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Finding the Fourth Proportional to 820.76, 1,230.66 and 723.49

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Solution

The fourth proportional to 820.76, 1,230.66 and 723.49 is: 1,084.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.76 : 1,230.66 = 723.49 : x
  2. Step 2: Convert to fraction form
    820.76/1,230.66 = 723.49/x
  3. Step 3: Cross multiply
    820.76x = 1,230.66 × 723.49
  4. Step 4: Simplify right side
    820.76x = 890,369.84
  5. Step 5: Solve for x
    x = 890,369.84/820.76
  6. Step 6: Final answer
    x = 1,084.82

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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.