Home / 427,920.55-641,982.14-139,730.78

Finding the Fourth Proportional to 427,920.55, 641,982.14 and 139,730.78

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Solution

The fourth proportional to 427,920.55, 641,982.14 and 139,730.78 is: 209,629.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,920.55 : 641,982.14 = 139,730.78 : x
  2. Step 2: Convert to fraction form
    427,920.55/641,982.14 = 139,730.78/x
  3. Step 3: Cross multiply
    427,920.55x = 641,982.14 × 139,730.78
  4. Step 4: Simplify right side
    427,920.55x = 89,704,665,168.27
  5. Step 5: Solve for x
    x = 89,704,665,168.27/427,920.55
  6. Step 6: Final answer
    x = 209,629.25

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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.