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Finding the Fourth Proportional to 143,859.40, 215,820.23 and 55,112.90

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Solution

The fourth proportional to 143,859.40, 215,820.23 and 55,112.90 is: 82,681.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,859.40 : 215,820.23 = 55,112.90 : x
  2. Step 2: Convert to fraction form
    143,859.40/215,820.23 = 55,112.90/x
  3. Step 3: Cross multiply
    143,859.40x = 215,820.23 × 55,112.90
  4. Step 4: Simplify right side
    143,859.40x = 11,894,478,753.97
  5. Step 5: Solve for x
    x = 11,894,478,753.97/143,859.40
  6. Step 6: Final answer
    x = 82,681.28

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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.