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Finding the Fourth Proportional to 1,428.81, 2,143.09 and 563.13

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Solution

The fourth proportional to 1,428.81, 2,143.09 and 563.13 is: 844.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.81 : 2,143.09 = 563.13 : x
  2. Step 2: Convert to fraction form
    1,428.81/2,143.09 = 563.13/x
  3. Step 3: Cross multiply
    1,428.81x = 2,143.09 × 563.13
  4. Step 4: Simplify right side
    1,428.81x = 1,206,838.27
  5. Step 5: Solve for x
    x = 1,206,838.27/1,428.81
  6. Step 6: Final answer
    x = 844.65

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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.