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Finding the Fourth Proportional to 65,963.20, 91,034.40 and 40,820.80

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Solution

The fourth proportional to 65,963.20, 91,034.40 and 40,820.80 is: 56,335.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,963.20 : 91,034.40 = 40,820.80 : x
  2. Step 2: Convert to fraction form
    65,963.20/91,034.40 = 40,820.80/x
  3. Step 3: Cross multiply
    65,963.20x = 91,034.40 × 40,820.80
  4. Step 4: Simplify right side
    65,963.20x = 3,716,097,035.52
  5. Step 5: Solve for x
    x = 3,716,097,035.52/65,963.20
  6. Step 6: Final answer
    x = 56,335.91

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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.