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Finding the Fourth Proportional to 564.80, 847.38 and 391.64

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Solution

The fourth proportional to 564.80, 847.38 and 391.64 is: 587.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.80 : 847.38 = 391.64 : x
  2. Step 2: Convert to fraction form
    564.80/847.38 = 391.64/x
  3. Step 3: Cross multiply
    564.80x = 847.38 × 391.64
  4. Step 4: Simplify right side
    564.80x = 331,867.90
  5. Step 5: Solve for x
    x = 331,867.90/564.80
  6. Step 6: Final answer
    x = 587.58

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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.