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Finding the Fourth Proportional to 393,299.76, 542,772.90 and 221,221.20

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Solution

The fourth proportional to 393,299.76, 542,772.90 and 221,221.20 is: 305,296.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,299.76 : 542,772.90 = 221,221.20 : x
  2. Step 2: Convert to fraction form
    393,299.76/542,772.90 = 221,221.20/x
  3. Step 3: Cross multiply
    393,299.76x = 542,772.90 × 221,221.20
  4. Step 4: Simplify right side
    393,299.76x = 120,072,872,265.48
  5. Step 5: Solve for x
    x = 120,072,872,265.48/393,299.76
  6. Step 6: Final answer
    x = 305,296.07

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1.5x scale

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.