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Finding the Fourth Proportional to 564.57, 778.82 and 387.59

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Solution

The fourth proportional to 564.57, 778.82 and 387.59 is: 534.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.57 : 778.82 = 387.59 : x
  2. Step 2: Convert to fraction form
    564.57/778.82 = 387.59/x
  3. Step 3: Cross multiply
    564.57x = 778.82 × 387.59
  4. Step 4: Simplify right side
    564.57x = 301,857.01
  5. Step 5: Solve for x
    x = 301,857.01/564.57
  6. Step 6: Final answer
    x = 534.67

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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.