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Finding the Fourth Proportional to 874.21, 1,205.90 and 563.71

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Solution

The fourth proportional to 874.21, 1,205.90 and 563.71 is: 777.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.21 : 1,205.90 = 563.71 : x
  2. Step 2: Convert to fraction form
    874.21/1,205.90 = 563.71/x
  3. Step 3: Cross multiply
    874.21x = 1,205.90 × 563.71
  4. Step 4: Simplify right side
    874.21x = 679,772.06
  5. Step 5: Solve for x
    x = 679,772.06/874.21
  6. Step 6: Final answer
    x = 777.59

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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.