Home / 685,820.78-1,028,355.32-212,374.70

Finding the Fourth Proportional to 685,820.78, 1,028,355.32 and 212,374.70

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Solution

The fourth proportional to 685,820.78, 1,028,355.32 and 212,374.70 is: 318,445.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,820.78 : 1,028,355.32 = 212,374.70 : x
  2. Step 2: Convert to fraction form
    685,820.78/1,028,355.32 = 212,374.70/x
  3. Step 3: Cross multiply
    685,820.78x = 1,028,355.32 × 212,374.70
  4. Step 4: Simplify right side
    685,820.78x = 218,396,652,578.40
  5. Step 5: Solve for x
    x = 218,396,652,578.40/685,820.78
  6. Step 6: Final answer
    x = 318,445.66

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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.