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Finding the Fourth Proportional to 812.32, 1,121.00 and 439.30

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Solution

The fourth proportional to 812.32, 1,121.00 and 439.30 is: 606.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.32 : 1,121.00 = 439.30 : x
  2. Step 2: Convert to fraction form
    812.32/1,121.00 = 439.30/x
  3. Step 3: Cross multiply
    812.32x = 1,121.00 × 439.30
  4. Step 4: Simplify right side
    812.32x = 492,447.50
  5. Step 5: Solve for x
    x = 492,447.50/812.32
  6. Step 6: Final answer
    x = 606.23

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Double scale
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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.