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Finding the Fourth Proportional to 3,108.56, 4,661.21 and 916.99

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Solution

The fourth proportional to 3,108.56, 4,661.21 and 916.99 is: 1,375.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,108.56 : 4,661.21 = 916.99 : x
  2. Step 2: Convert to fraction form
    3,108.56/4,661.21 = 916.99/x
  3. Step 3: Cross multiply
    3,108.56x = 4,661.21 × 916.99
  4. Step 4: Simplify right side
    3,108.56x = 4,274,273.60
  5. Step 5: Solve for x
    x = 4,274,273.60/3,108.56
  6. Step 6: Final answer
    x = 1,375.00

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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.