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Finding the Fourth Proportional to 65,720.13, 90,693.72 and 35,912.13

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Solution

The fourth proportional to 65,720.13, 90,693.72 and 35,912.13 is: 49,558.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.13 : 90,693.72 = 35,912.13 : x
  2. Step 2: Convert to fraction form
    65,720.13/90,693.72 = 35,912.13/x
  3. Step 3: Cross multiply
    65,720.13x = 90,693.72 × 35,912.13
  4. Step 4: Simplify right side
    65,720.13x = 3,257,004,662.82
  5. Step 5: Solve for x
    x = 3,257,004,662.82/65,720.13
  6. Step 6: Final answer
    x = 49,558.71

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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.