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Finding the Fourth Proportional to 812.37, 1,217.63 and 400.63

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Solution

The fourth proportional to 812.37, 1,217.63 and 400.63 is: 600.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.37 : 1,217.63 = 400.63 : x
  2. Step 2: Convert to fraction form
    812.37/1,217.63 = 400.63/x
  3. Step 3: Cross multiply
    812.37x = 1,217.63 × 400.63
  4. Step 4: Simplify right side
    812.37x = 487,819.11
  5. Step 5: Solve for x
    x = 487,819.11/812.37
  6. Step 6: Final answer
    x = 600.49

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Double scale
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1.5x scale

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.