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Finding the Fourth Proportional to 817.23, 1,223.55 and 636.74

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Solution

The fourth proportional to 817.23, 1,223.55 and 636.74 is: 953.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.23 : 1,223.55 = 636.74 : x
  2. Step 2: Convert to fraction form
    817.23/1,223.55 = 636.74/x
  3. Step 3: Cross multiply
    817.23x = 1,223.55 × 636.74
  4. Step 4: Simplify right side
    817.23x = 779,077.11
  5. Step 5: Solve for x
    x = 779,077.11/817.23
  6. Step 6: Final answer
    x = 953.31

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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.