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Finding the Fourth Proportional to 566.90, 781.86 and 399.41

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Solution

The fourth proportional to 566.90, 781.86 and 399.41 is: 550.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    566.90 : 781.86 = 399.41 : x
  2. Step 2: Convert to fraction form
    566.90/781.86 = 399.41/x
  3. Step 3: Cross multiply
    566.90x = 781.86 × 399.41
  4. Step 4: Simplify right side
    566.90x = 312,277.30
  5. Step 5: Solve for x
    x = 312,277.30/566.90
  6. Step 6: Final answer
    x = 550.85

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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.