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Finding the Fourth Proportional to 1,029.20, 1,420.32 and 563.48

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Solution

The fourth proportional to 1,029.20, 1,420.32 and 563.48 is: 777.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.20 : 1,420.32 = 563.48 : x
  2. Step 2: Convert to fraction form
    1,029.20/1,420.32 = 563.48/x
  3. Step 3: Cross multiply
    1,029.20x = 1,420.32 × 563.48
  4. Step 4: Simplify right side
    1,029.20x = 800,321.91
  5. Step 5: Solve for x
    x = 800,321.91/1,029.20
  6. Step 6: Final answer
    x = 777.62

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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.