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Finding the Fourth Proportional to 827.70, 1,243.95 and 722.10

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Solution

The fourth proportional to 827.70, 1,243.95 and 722.10 is: 1,085.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.70 : 1,243.95 = 722.10 : x
  2. Step 2: Convert to fraction form
    827.70/1,243.95 = 722.10/x
  3. Step 3: Cross multiply
    827.70x = 1,243.95 × 722.10
  4. Step 4: Simplify right side
    827.70x = 898,256.30
  5. Step 5: Solve for x
    x = 898,256.30/827.70
  6. Step 6: Final answer
    x = 1,085.24

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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.