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Finding the Fourth Proportional to 439,419.80, 659,129.70 and 289,731.80

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Solution

The fourth proportional to 439,419.80, 659,129.70 and 289,731.80 is: 434,597.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,419.80 : 659,129.70 = 289,731.80 : x
  2. Step 2: Convert to fraction form
    439,419.80/659,129.70 = 289,731.80/x
  3. Step 3: Cross multiply
    439,419.80x = 659,129.70 × 289,731.80
  4. Step 4: Simplify right side
    439,419.80x = 190,970,834,414.46
  5. Step 5: Solve for x
    x = 190,970,834,414.46/439,419.80
  6. Step 6: Final answer
    x = 434,597.70

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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.