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Finding the Fourth Proportional to 65,987.45, 90,961.91 and 40,446.48

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Solution

The fourth proportional to 65,987.45, 90,961.91 and 40,446.48 is: 55,754.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,987.45 : 90,961.91 = 40,446.48 : x
  2. Step 2: Convert to fraction form
    65,987.45/90,961.91 = 40,446.48/x
  3. Step 3: Cross multiply
    65,987.45x = 90,961.91 × 40,446.48
  4. Step 4: Simplify right side
    65,987.45x = 3,679,089,073.58
  5. Step 5: Solve for x
    x = 3,679,089,073.58/65,987.45
  6. Step 6: Final answer
    x = 55,754.38

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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.