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Finding the Fourth Proportional to 2,918.56, 4,380 and 1,621.12

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Solution

The fourth proportional to 2,918.56, 4,380 and 1,621.12 is: 2,432.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,918.56 : 4,380 = 1,621.12 : x
  2. Step 2: Convert to fraction form
    2,918.56/4,380 = 1,621.12/x
  3. Step 3: Cross multiply
    2,918.56x = 4,380 × 1,621.12
  4. Step 4: Simplify right side
    2,918.56x = 7,100,505.60
  5. Step 5: Solve for x
    x = 7,100,505.60/2,918.56
  6. Step 6: Final answer
    x = 2,432.88

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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.