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Finding the Fourth Proportional to 1,212.90, 1,818.75 and 563.22

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Solution

The fourth proportional to 1,212.90, 1,818.75 and 563.22 is: 844.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.90 : 1,818.75 = 563.22 : x
  2. Step 2: Convert to fraction form
    1,212.90/1,818.75 = 563.22/x
  3. Step 3: Cross multiply
    1,212.90x = 1,818.75 × 563.22
  4. Step 4: Simplify right side
    1,212.90x = 1,024,356.38
  5. Step 5: Solve for x
    x = 1,024,356.38/1,212.90
  6. Step 6: Final answer
    x = 844.55

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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.