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Finding the Fourth Proportional to 1,221.90, 1,832.16 and 399.95

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Solution

The fourth proportional to 1,221.90, 1,832.16 and 399.95 is: 599.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.90 : 1,832.16 = 399.95 : x
  2. Step 2: Convert to fraction form
    1,221.90/1,832.16 = 399.95/x
  3. Step 3: Cross multiply
    1,221.90x = 1,832.16 × 399.95
  4. Step 4: Simplify right side
    1,221.90x = 732,767.81
  5. Step 5: Solve for x
    x = 732,767.81/1,221.90
  6. Step 6: Final answer
    x = 599.70

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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.