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Finding the Fourth Proportional to 65,448.72, 90,316.74 and 39,997.64

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Solution

The fourth proportional to 65,448.72, 90,316.74 and 39,997.64 is: 55,195.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,448.72 : 90,316.74 = 39,997.64 : x
  2. Step 2: Convert to fraction form
    65,448.72/90,316.74 = 39,997.64/x
  3. Step 3: Cross multiply
    65,448.72x = 90,316.74 × 39,997.64
  4. Step 4: Simplify right side
    65,448.72x = 3,612,456,452.49
  5. Step 5: Solve for x
    x = 3,612,456,452.49/65,448.72
  6. Step 6: Final answer
    x = 55,195.22

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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.