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Finding the Fourth Proportional to 812.53, 1,121.29 and 439.51

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Solution

The fourth proportional to 812.53, 1,121.29 and 439.51 is: 606.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.53 : 1,121.29 = 439.51 : x
  2. Step 2: Convert to fraction form
    812.53/1,121.29 = 439.51/x
  3. Step 3: Cross multiply
    812.53x = 1,121.29 × 439.51
  4. Step 4: Simplify right side
    812.53x = 492,810.36
  5. Step 5: Solve for x
    x = 492,810.36/812.53
  6. Step 6: Final answer
    x = 606.52

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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.