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Finding the Fourth Proportional to 1,261.40, 1,892.12 and 481.45

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Solution

The fourth proportional to 1,261.40, 1,892.12 and 481.45 is: 722.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.40 : 1,892.12 = 481.45 : x
  2. Step 2: Convert to fraction form
    1,261.40/1,892.12 = 481.45/x
  3. Step 3: Cross multiply
    1,261.40x = 1,892.12 × 481.45
  4. Step 4: Simplify right side
    1,261.40x = 910,957.65
  5. Step 5: Solve for x
    x = 910,957.65/1,261.40
  6. Step 6: Final answer
    x = 722.18

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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.