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Finding the Fourth Proportional to 3,131.76, 4,697.76 and 940.80

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Solution

The fourth proportional to 3,131.76, 4,697.76 and 940.80 is: 1,411.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.76 : 4,697.76 = 940.80 : x
  2. Step 2: Convert to fraction form
    3,131.76/4,697.76 = 940.80/x
  3. Step 3: Cross multiply
    3,131.76x = 4,697.76 × 940.80
  4. Step 4: Simplify right side
    3,131.76x = 4,419,652.61
  5. Step 5: Solve for x
    x = 4,419,652.61/3,131.76
  6. Step 6: Final answer
    x = 1,411.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.