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Finding the Fourth Proportional to 143,998.70, 215,998.05 and 81,013.10

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Solution

The fourth proportional to 143,998.70, 215,998.05 and 81,013.10 is: 121,519.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,998.70 : 215,998.05 = 81,013.10 : x
  2. Step 2: Convert to fraction form
    143,998.70/215,998.05 = 81,013.10/x
  3. Step 3: Cross multiply
    143,998.70x = 215,998.05 × 81,013.10
  4. Step 4: Simplify right side
    143,998.70x = 17,498,671,624.46
  5. Step 5: Solve for x
    x = 17,498,671,624.46/143,998.70
  6. Step 6: Final answer
    x = 121,519.65

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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.