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Finding the Fourth Proportional to 565.62, 779.94 and 491.28

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Solution

The fourth proportional to 565.62, 779.94 and 491.28 is: 677.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.62 : 779.94 = 491.28 : x
  2. Step 2: Convert to fraction form
    565.62/779.94 = 491.28/x
  3. Step 3: Cross multiply
    565.62x = 779.94 × 491.28
  4. Step 4: Simplify right side
    565.62x = 383,168.92
  5. Step 5: Solve for x
    x = 383,168.92/565.62
  6. Step 6: Final answer
    x = 677.43

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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.