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Finding the Fourth Proportional to 143,221.70, 214,831.17 and 87,077.31

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Solution

The fourth proportional to 143,221.70, 214,831.17 and 87,077.31 is: 130,615.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,221.70 : 214,831.17 = 87,077.31 : x
  2. Step 2: Convert to fraction form
    143,221.70/214,831.17 = 87,077.31/x
  3. Step 3: Cross multiply
    143,221.70x = 214,831.17 × 87,077.31
  4. Step 4: Simplify right side
    143,221.70x = 18,706,920,790.56
  5. Step 5: Solve for x
    x = 18,706,920,790.56/143,221.70
  6. Step 6: Final answer
    x = 130,615.13

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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.