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Finding the Fourth Proportional to 65,761.07, 90,728.86 and 40,240.80

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Solution

The fourth proportional to 65,761.07, 90,728.86 and 40,240.80 is: 55,519.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,761.07 : 90,728.86 = 40,240.80 : x
  2. Step 2: Convert to fraction form
    65,761.07/90,728.86 = 40,240.80/x
  3. Step 3: Cross multiply
    65,761.07x = 90,728.86 × 40,240.80
  4. Step 4: Simplify right side
    65,761.07x = 3,651,001,884.34
  5. Step 5: Solve for x
    x = 3,651,001,884.34/65,761.07
  6. Step 6: Final answer
    x = 55,519.20

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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.