Home / 687,228.60-1,028,919.56-518,220

Finding the Fourth Proportional to 687,228.60, 1,028,919.56 and 518,220

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Solution

The fourth proportional to 687,228.60, 1,028,919.56 and 518,220 is: 775,879.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,228.60 : 1,028,919.56 = 518,220 : x
  2. Step 2: Convert to fraction form
    687,228.60/1,028,919.56 = 518,220/x
  3. Step 3: Cross multiply
    687,228.60x = 1,028,919.56 × 518,220
  4. Step 4: Simplify right side
    687,228.60x = 533,206,694,383.20
  5. Step 5: Solve for x
    x = 533,206,694,383.20/687,228.60
  6. Step 6: Final answer
    x = 775,879.66

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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.