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Finding the Fourth Proportional to 940.20, 1,410.78 and 385.31

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Solution

The fourth proportional to 940.20, 1,410.78 and 385.31 is: 578.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.20 : 1,410.78 = 385.31 : x
  2. Step 2: Convert to fraction form
    940.20/1,410.78 = 385.31/x
  3. Step 3: Cross multiply
    940.20x = 1,410.78 × 385.31
  4. Step 4: Simplify right side
    940.20x = 543,586.68
  5. Step 5: Solve for x
    x = 543,586.68/940.20
  6. Step 6: Final answer
    x = 578.16

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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.