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Finding the Fourth Proportional to 426,309.89, 639,530.44 and 141,902.89

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Solution

The fourth proportional to 426,309.89, 639,530.44 and 141,902.89 is: 212,876.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,309.89 : 639,530.44 = 141,902.89 : x
  2. Step 2: Convert to fraction form
    426,309.89/639,530.44 = 141,902.89/x
  3. Step 3: Cross multiply
    426,309.89x = 639,530.44 × 141,902.89
  4. Step 4: Simplify right side
    426,309.89x = 90,751,215,725.39
  5. Step 5: Solve for x
    x = 90,751,215,725.39/426,309.89
  6. Step 6: Final answer
    x = 212,876.17

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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.