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Finding the Fourth Proportional to 430,199.91, 645,139.54 and 126,512.79

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Solution

The fourth proportional to 430,199.91, 645,139.54 and 126,512.79 is: 189,722.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,199.91 : 645,139.54 = 126,512.79 : x
  2. Step 2: Convert to fraction form
    430,199.91/645,139.54 = 126,512.79/x
  3. Step 3: Cross multiply
    430,199.91x = 645,139.54 × 126,512.79
  4. Step 4: Simplify right side
    430,199.91x = 81,618,400,171.95
  5. Step 5: Solve for x
    x = 81,618,400,171.95/430,199.91
  6. Step 6: Final answer
    x = 189,722.03

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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.