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Finding the Fourth Proportional to 115,638.72, 159,579.36 and 65,336.64

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Solution

The fourth proportional to 115,638.72, 159,579.36 and 65,336.64 is: 90,163.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,638.72 : 159,579.36 = 65,336.64 : x
  2. Step 2: Convert to fraction form
    115,638.72/159,579.36 = 65,336.64/x
  3. Step 3: Cross multiply
    115,638.72x = 159,579.36 × 65,336.64
  4. Step 4: Simplify right side
    115,638.72x = 10,426,379,195.75
  5. Step 5: Solve for x
    x = 10,426,379,195.75/115,638.72
  6. Step 6: Final answer
    x = 90,163.39

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1.5x scale

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.