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Finding the Fourth Proportional to 1,224.05, 1,834.49 and 785.13

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Solution

The fourth proportional to 1,224.05, 1,834.49 and 785.13 is: 1,176.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.05 : 1,834.49 = 785.13 : x
  2. Step 2: Convert to fraction form
    1,224.05/1,834.49 = 785.13/x
  3. Step 3: Cross multiply
    1,224.05x = 1,834.49 × 785.13
  4. Step 4: Simplify right side
    1,224.05x = 1,440,309.21
  5. Step 5: Solve for x
    x = 1,440,309.21/1,224.05
  6. Step 6: Final answer
    x = 1,176.68

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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.