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Finding the Fourth Proportional to 399,089.28, 550,742.08 and 220,240

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Solution

The fourth proportional to 399,089.28, 550,742.08 and 220,240 is: 303,930.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,089.28 : 550,742.08 = 220,240 : x
  2. Step 2: Convert to fraction form
    399,089.28/550,742.08 = 220,240/x
  3. Step 3: Cross multiply
    399,089.28x = 550,742.08 × 220,240
  4. Step 4: Simplify right side
    399,089.28x = 121,295,435,699.20
  5. Step 5: Solve for x
    x = 121,295,435,699.20/399,089.28
  6. Step 6: Final answer
    x = 303,930.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.