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Finding the Fourth Proportional to 65,505.10, 90,305.51 and 55,392.97

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Solution

The fourth proportional to 65,505.10, 90,305.51 and 55,392.97 is: 76,364.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,505.10 : 90,305.51 = 55,392.97 : x
  2. Step 2: Convert to fraction form
    65,505.10/90,305.51 = 55,392.97/x
  3. Step 3: Cross multiply
    65,505.10x = 90,305.51 × 55,392.97
  4. Step 4: Simplify right side
    65,505.10x = 5,002,290,129.30
  5. Step 5: Solve for x
    x = 5,002,290,129.30/65,505.10
  6. Step 6: Final answer
    x = 76,364.90

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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.