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Finding the Fourth Proportional to 812.48, 1,121.78 and 550.40

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Solution

The fourth proportional to 812.48, 1,121.78 and 550.40 is: 759.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.48 : 1,121.78 = 550.40 : x
  2. Step 2: Convert to fraction form
    812.48/1,121.78 = 550.40/x
  3. Step 3: Cross multiply
    812.48x = 1,121.78 × 550.40
  4. Step 4: Simplify right side
    812.48x = 617,427.71
  5. Step 5: Solve for x
    x = 617,427.71/812.48
  6. Step 6: Final answer
    x = 759.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.