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Finding the Fourth Proportional to 1,221.47, 1,832.31 and 399.74

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Solution

The fourth proportional to 1,221.47, 1,832.31 and 399.74 is: 599.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.47 : 1,832.31 = 399.74 : x
  2. Step 2: Convert to fraction form
    1,221.47/1,832.31 = 399.74/x
  3. Step 3: Cross multiply
    1,221.47x = 1,832.31 × 399.74
  4. Step 4: Simplify right side
    1,221.47x = 732,447.60
  5. Step 5: Solve for x
    x = 732,447.60/1,221.47
  6. Step 6: Final answer
    x = 599.64

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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.