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Finding the Fourth Proportional to 521,661.30, 781,507.80 and 486,231.90

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Solution

The fourth proportional to 521,661.30, 781,507.80 and 486,231.90 is: 728,430.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,661.30 : 781,507.80 = 486,231.90 : x
  2. Step 2: Convert to fraction form
    521,661.30/781,507.80 = 486,231.90/x
  3. Step 3: Cross multiply
    521,661.30x = 781,507.80 × 486,231.90
  4. Step 4: Simplify right side
    521,661.30x = 379,994,022,458.82
  5. Step 5: Solve for x
    x = 379,994,022,458.82/521,661.30
  6. Step 6: Final answer
    x = 728,430.54

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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.