Home / 81,772.20-122,831.10-78,834.60

Finding the Fourth Proportional to 81,772.20, 122,831.10 and 78,834.60

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Solution

The fourth proportional to 81,772.20, 122,831.10 and 78,834.60 is: 118,418.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,772.20 : 122,831.10 = 78,834.60 : x
  2. Step 2: Convert to fraction form
    81,772.20/122,831.10 = 78,834.60/x
  3. Step 3: Cross multiply
    81,772.20x = 122,831.10 × 78,834.60
  4. Step 4: Simplify right side
    81,772.20x = 9,683,340,636.06
  5. Step 5: Solve for x
    x = 9,683,340,636.06/81,772.20
  6. Step 6: Final answer
    x = 118,418.49

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1.5x scale

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.