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Finding the Fourth Proportional to 426,722.76, 639,634.86 and 142,337.16

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Solution

The fourth proportional to 426,722.76, 639,634.86 and 142,337.16 is: 213,355.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,722.76 : 639,634.86 = 142,337.16 : x
  2. Step 2: Convert to fraction form
    426,722.76/639,634.86 = 142,337.16/x
  3. Step 3: Cross multiply
    426,722.76x = 639,634.86 × 142,337.16
  4. Step 4: Simplify right side
    426,722.76x = 91,043,809,409.40
  5. Step 5: Solve for x
    x = 91,043,809,409.40/426,722.76
  6. Step 6: Final answer
    x = 213,355.88

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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.