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Finding the Fourth Proportional to 938.57, 1,406.03 and 475.79

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Solution

The fourth proportional to 938.57, 1,406.03 and 475.79 is: 712.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.57 : 1,406.03 = 475.79 : x
  2. Step 2: Convert to fraction form
    938.57/1,406.03 = 475.79/x
  3. Step 3: Cross multiply
    938.57x = 1,406.03 × 475.79
  4. Step 4: Simplify right side
    938.57x = 668,965.60
  5. Step 5: Solve for x
    x = 668,965.60/938.57
  6. Step 6: Final answer
    x = 712.75

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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.