Home / 89,912.20-134,690.10-78,831.40

Finding the Fourth Proportional to 89,912.20, 134,690.10 and 78,831.40

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Solution

The fourth proportional to 89,912.20, 134,690.10 and 78,831.40 is: 118,090.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,912.20 : 134,690.10 = 78,831.40 : x
  2. Step 2: Convert to fraction form
    89,912.20/134,690.10 = 78,831.40/x
  3. Step 3: Cross multiply
    89,912.20x = 134,690.10 × 78,831.40
  4. Step 4: Simplify right side
    89,912.20x = 10,617,809,149.14
  5. Step 5: Solve for x
    x = 10,617,809,149.14/89,912.20
  6. Step 6: Final answer
    x = 118,090.86

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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.