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Finding the Fourth Proportional to 565.43, 780.26 and 355.64

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Solution

The fourth proportional to 565.43, 780.26 and 355.64 is: 490.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.43 : 780.26 = 355.64 : x
  2. Step 2: Convert to fraction form
    565.43/780.26 = 355.64/x
  3. Step 3: Cross multiply
    565.43x = 780.26 × 355.64
  4. Step 4: Simplify right side
    565.43x = 277,485.99
  5. Step 5: Solve for x
    x = 277,485.99/565.43
  6. Step 6: Final answer
    x = 490.76

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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.