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Finding the Fourth Proportional to 521,989.39, 720,311.26 and 307,087.93

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Solution

The fourth proportional to 521,989.39, 720,311.26 and 307,087.93 is: 423,761.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,989.39 : 720,311.26 = 307,087.93 : x
  2. Step 2: Convert to fraction form
    521,989.39/720,311.26 = 307,087.93/x
  3. Step 3: Cross multiply
    521,989.39x = 720,311.26 × 307,087.93
  4. Step 4: Simplify right side
    521,989.39x = 221,198,893,789.09
  5. Step 5: Solve for x
    x = 221,198,893,789.09/521,989.39
  6. Step 6: Final answer
    x = 423,761.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.