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Finding the Fourth Proportional to 832.10, 1,247.86 and 338.38

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Solution

The fourth proportional to 832.10, 1,247.86 and 338.38 is: 507.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.10 : 1,247.86 = 338.38 : x
  2. Step 2: Convert to fraction form
    832.10/1,247.86 = 338.38/x
  3. Step 3: Cross multiply
    832.10x = 1,247.86 × 338.38
  4. Step 4: Simplify right side
    832.10x = 422,250.87
  5. Step 5: Solve for x
    x = 422,250.87/832.10
  6. Step 6: Final answer
    x = 507.45

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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.