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Finding the Fourth Proportional to 521,990, 720,346.92 and 283,526

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Solution

The fourth proportional to 521,990, 720,346.92 and 283,526 is: 391,266.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,990 : 720,346.92 = 283,526 : x
  2. Step 2: Convert to fraction form
    521,990/720,346.92 = 283,526/x
  3. Step 3: Cross multiply
    521,990x = 720,346.92 × 283,526
  4. Step 4: Simplify right side
    521,990x = 204,237,080,839.92
  5. Step 5: Solve for x
    x = 204,237,080,839.92/521,990
  6. Step 6: Final answer
    x = 391,266.27

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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.