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Finding the Fourth Proportional to 426,109.20, 639,163.80 and 159,878.40

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Solution

The fourth proportional to 426,109.20, 639,163.80 and 159,878.40 is: 239,817.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,109.20 : 639,163.80 = 159,878.40 : x
  2. Step 2: Convert to fraction form
    426,109.20/639,163.80 = 159,878.40/x
  3. Step 3: Cross multiply
    426,109.20x = 639,163.80 × 159,878.40
  4. Step 4: Simplify right side
    426,109.20x = 102,188,485,681.92
  5. Step 5: Solve for x
    x = 102,188,485,681.92/426,109.20
  6. Step 6: Final answer
    x = 239,817.60

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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.