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Finding the Fourth Proportional to 403.87, 609.26 and 391.59

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Solution

The fourth proportional to 403.87, 609.26 and 391.59 is: 590.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.87 : 609.26 = 391.59 : x
  2. Step 2: Convert to fraction form
    403.87/609.26 = 391.59/x
  3. Step 3: Cross multiply
    403.87x = 609.26 × 391.59
  4. Step 4: Simplify right side
    403.87x = 238,580.12
  5. Step 5: Solve for x
    x = 238,580.12/403.87
  6. Step 6: Final answer
    x = 590.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.