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Finding the Fourth Proportional to 393,059.10, 542,440.78 and 221,031.20

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Solution

The fourth proportional to 393,059.10, 542,440.78 and 221,031.20 is: 305,033.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,059.10 : 542,440.78 = 221,031.20 : x
  2. Step 2: Convert to fraction form
    393,059.10/542,440.78 = 221,031.20/x
  3. Step 3: Cross multiply
    393,059.10x = 542,440.78 × 221,031.20
  4. Step 4: Simplify right side
    393,059.10x = 119,896,335,527.93
  5. Step 5: Solve for x
    x = 119,896,335,527.93/393,059.10
  6. Step 6: Final answer
    x = 305,033.86

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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.