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Finding the Fourth Proportional to 812.37, 1,121.07 and 439.35

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Solution

The fourth proportional to 812.37, 1,121.07 and 439.35 is: 606.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.37 : 1,121.07 = 439.35 : x
  2. Step 2: Convert to fraction form
    812.37/1,121.07 = 439.35/x
  3. Step 3: Cross multiply
    812.37x = 1,121.07 × 439.35
  4. Step 4: Simplify right side
    812.37x = 492,536.25
  5. Step 5: Solve for x
    x = 492,536.25/812.37
  6. Step 6: Final answer
    x = 606.30

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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.