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Finding the Fourth Proportional to 1,261.49, 1,891.71 and 742.52

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Solution

The fourth proportional to 1,261.49, 1,891.71 and 742.52 is: 1,113.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.49 : 1,891.71 = 742.52 : x
  2. Step 2: Convert to fraction form
    1,261.49/1,891.71 = 742.52/x
  3. Step 3: Cross multiply
    1,261.49x = 1,891.71 × 742.52
  4. Step 4: Simplify right side
    1,261.49x = 1,404,637.24
  5. Step 5: Solve for x
    x = 1,404,637.24/1,261.49
  6. Step 6: Final answer
    x = 1,113.48

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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.