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Finding the Fourth Proportional to 943.09, 1,409.69 and 818.71

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Solution

The fourth proportional to 943.09, 1,409.69 and 818.71 is: 1,223.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.09 : 1,409.69 = 818.71 : x
  2. Step 2: Convert to fraction form
    943.09/1,409.69 = 818.71/x
  3. Step 3: Cross multiply
    943.09x = 1,409.69 × 818.71
  4. Step 4: Simplify right side
    943.09x = 1,154,121.22
  5. Step 5: Solve for x
    x = 1,154,121.22/943.09
  6. Step 6: Final answer
    x = 1,223.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.