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Finding the Fourth Proportional to 426,378.33, 639,509.17 and 126,905.13

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Solution

The fourth proportional to 426,378.33, 639,509.17 and 126,905.13 is: 190,340.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,378.33 : 639,509.17 = 126,905.13 : x
  2. Step 2: Convert to fraction form
    426,378.33/639,509.17 = 126,905.13/x
  3. Step 3: Cross multiply
    426,378.33x = 639,509.17 × 126,905.13
  4. Step 4: Simplify right side
    426,378.33x = 81,156,994,355.04
  5. Step 5: Solve for x
    x = 81,156,994,355.04/426,378.33
  6. Step 6: Final answer
    x = 190,340.34

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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.