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Finding the Fourth Proportional to 771.20, 1,156.16 and 338.24

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Solution

The fourth proportional to 771.20, 1,156.16 and 338.24 is: 507.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.20 : 1,156.16 = 338.24 : x
  2. Step 2: Convert to fraction form
    771.20/1,156.16 = 338.24/x
  3. Step 3: Cross multiply
    771.20x = 1,156.16 × 338.24
  4. Step 4: Simplify right side
    771.20x = 391,059.56
  5. Step 5: Solve for x
    x = 391,059.56/771.20
  6. Step 6: Final answer
    x = 507.08

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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.