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Finding the Fourth Proportional to 771.71, 1,157.57 and 338.87

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Solution

The fourth proportional to 771.71, 1,157.57 and 338.87 is: 508.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.71 : 1,157.57 = 338.87 : x
  2. Step 2: Convert to fraction form
    771.71/1,157.57 = 338.87/x
  3. Step 3: Cross multiply
    771.71x = 1,157.57 × 338.87
  4. Step 4: Simplify right side
    771.71x = 392,267.78
  5. Step 5: Solve for x
    x = 392,267.78/771.71
  6. Step 6: Final answer
    x = 508.31

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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.