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Finding the Fourth Proportional to 135,781.72, 187,401.20 and 75,371.72

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Solution

The fourth proportional to 135,781.72, 187,401.20 and 75,371.72 is: 104,025.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,781.72 : 187,401.20 = 75,371.72 : x
  2. Step 2: Convert to fraction form
    135,781.72/187,401.20 = 75,371.72/x
  3. Step 3: Cross multiply
    135,781.72x = 187,401.20 × 75,371.72
  4. Step 4: Simplify right side
    135,781.72x = 14,124,749,460.20
  5. Step 5: Solve for x
    x = 14,124,749,460.20/135,781.72
  6. Step 6: Final answer
    x = 104,025.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.