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Finding the Fourth Proportional to 678.83, 1,015.89 and 563.49

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Solution

The fourth proportional to 678.83, 1,015.89 and 563.49 is: 843.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.83 : 1,015.89 = 563.49 : x
  2. Step 2: Convert to fraction form
    678.83/1,015.89 = 563.49/x
  3. Step 3: Cross multiply
    678.83x = 1,015.89 × 563.49
  4. Step 4: Simplify right side
    678.83x = 572,443.86
  5. Step 5: Solve for x
    x = 572,443.86/678.83
  6. Step 6: Final answer
    x = 843.28

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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.