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Finding the Fourth Proportional to 79,856.80, 119,785.20 and 70,640.80

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Solution

The fourth proportional to 79,856.80, 119,785.20 and 70,640.80 is: 105,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,856.80 : 119,785.20 = 70,640.80 : x
  2. Step 2: Convert to fraction form
    79,856.80/119,785.20 = 70,640.80/x
  3. Step 3: Cross multiply
    79,856.80x = 119,785.20 × 70,640.80
  4. Step 4: Simplify right side
    79,856.80x = 8,461,722,356.16
  5. Step 5: Solve for x
    x = 8,461,722,356.16/79,856.80
  6. Step 6: Final answer
    x = 105,961.20

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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.