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Finding the Fourth Proportional to 639.87, 883.67 and 571.16

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Solution

The fourth proportional to 639.87, 883.67 and 571.16 is: 788.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.87 : 883.67 = 571.16 : x
  2. Step 2: Convert to fraction form
    639.87/883.67 = 571.16/x
  3. Step 3: Cross multiply
    639.87x = 883.67 × 571.16
  4. Step 4: Simplify right side
    639.87x = 504,709.68
  5. Step 5: Solve for x
    x = 504,709.68/639.87
  6. Step 6: Final answer
    x = 788.77

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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.