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Finding the Fourth Proportional to 1,221.08, 1,830.93 and 399.28

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Solution

The fourth proportional to 1,221.08, 1,830.93 and 399.28 is: 598.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.08 : 1,830.93 = 399.28 : x
  2. Step 2: Convert to fraction form
    1,221.08/1,830.93 = 399.28/x
  3. Step 3: Cross multiply
    1,221.08x = 1,830.93 × 399.28
  4. Step 4: Simplify right side
    1,221.08x = 731,052.21
  5. Step 5: Solve for x
    x = 731,052.21/1,221.08
  6. Step 6: Final answer
    x = 598.70

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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.