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Finding the Fourth Proportional to 822.15, 1,231.61 and 740.21

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Solution

The fourth proportional to 822.15, 1,231.61 and 740.21 is: 1,108.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.15 : 1,231.61 = 740.21 : x
  2. Step 2: Convert to fraction form
    822.15/1,231.61 = 740.21/x
  3. Step 3: Cross multiply
    822.15x = 1,231.61 × 740.21
  4. Step 4: Simplify right side
    822.15x = 911,640.18
  5. Step 5: Solve for x
    x = 911,640.18/822.15
  6. Step 6: Final answer
    x = 1,108.85

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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.