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Finding the Fourth Proportional to 89,622.80, 134,725.80 and 76,792.40

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Solution

The fourth proportional to 89,622.80, 134,725.80 and 76,792.40 is: 115,438.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,622.80 : 134,725.80 = 76,792.40 : x
  2. Step 2: Convert to fraction form
    89,622.80/134,725.80 = 76,792.40/x
  3. Step 3: Cross multiply
    89,622.80x = 134,725.80 × 76,792.40
  4. Step 4: Simplify right side
    89,622.80x = 10,345,917,523.92
  5. Step 5: Solve for x
    x = 10,345,917,523.92/89,622.80
  6. Step 6: Final answer
    x = 115,438.45

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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.