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Finding the Fourth Proportional to 1,272.78, 1,756.50 and 713.21

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Solution

The fourth proportional to 1,272.78, 1,756.50 and 713.21 is: 984.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.78 : 1,756.50 = 713.21 : x
  2. Step 2: Convert to fraction form
    1,272.78/1,756.50 = 713.21/x
  3. Step 3: Cross multiply
    1,272.78x = 1,756.50 × 713.21
  4. Step 4: Simplify right side
    1,272.78x = 1,252,753.37
  5. Step 5: Solve for x
    x = 1,252,753.37/1,272.78
  6. Step 6: Final answer
    x = 984.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.