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Finding the Fourth Proportional to 143,835.60, 215,785.80 and 84,640.80

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Solution

The fourth proportional to 143,835.60, 215,785.80 and 84,640.80 is: 126,980.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,835.60 : 215,785.80 = 84,640.80 : x
  2. Step 2: Convert to fraction form
    143,835.60/215,785.80 = 84,640.80/x
  3. Step 3: Cross multiply
    143,835.60x = 215,785.80 × 84,640.80
  4. Step 4: Simplify right side
    143,835.60x = 18,264,282,740.64
  5. Step 5: Solve for x
    x = 18,264,282,740.64/143,835.60
  6. Step 6: Final answer
    x = 126,980.27

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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.