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Finding the Fourth Proportional to 771.32, 1,157.40 and 338.46

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Solution

The fourth proportional to 771.32, 1,157.40 and 338.46 is: 507.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.32 : 1,157.40 = 338.46 : x
  2. Step 2: Convert to fraction form
    771.32/1,157.40 = 338.46/x
  3. Step 3: Cross multiply
    771.32x = 1,157.40 × 338.46
  4. Step 4: Simplify right side
    771.32x = 391,733.60
  5. Step 5: Solve for x
    x = 391,733.60/771.32
  6. Step 6: Final answer
    x = 507.88

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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.