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Finding the Fourth Proportional to 564.46, 778.59 and 439.90

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Solution

The fourth proportional to 564.46, 778.59 and 439.90 is: 606.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.46 : 778.59 = 439.90 : x
  2. Step 2: Convert to fraction form
    564.46/778.59 = 439.90/x
  3. Step 3: Cross multiply
    564.46x = 778.59 × 439.90
  4. Step 4: Simplify right side
    564.46x = 342,501.74
  5. Step 5: Solve for x
    x = 342,501.74/564.46
  6. Step 6: Final answer
    x = 606.78

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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.