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Finding the Fourth Proportional to 200,913.90, 300,933.45 and 121,890.30

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Solution

The fourth proportional to 200,913.90, 300,933.45 and 121,890.30 is: 182,570.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,913.90 : 300,933.45 = 121,890.30 : x
  2. Step 2: Convert to fraction form
    200,913.90/300,933.45 = 121,890.30/x
  3. Step 3: Cross multiply
    200,913.90x = 300,933.45 × 121,890.30
  4. Step 4: Simplify right side
    200,913.90x = 36,680,868,500.54
  5. Step 5: Solve for x
    x = 36,680,868,500.54/200,913.90
  6. Step 6: Final answer
    x = 182,570.09

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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.