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Finding the Fourth Proportional to 1,247.50, 1,722.36 and 782.56

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Solution

The fourth proportional to 1,247.50, 1,722.36 and 782.56 is: 1,080.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.50 : 1,722.36 = 782.56 : x
  2. Step 2: Convert to fraction form
    1,247.50/1,722.36 = 782.56/x
  3. Step 3: Cross multiply
    1,247.50x = 1,722.36 × 782.56
  4. Step 4: Simplify right side
    1,247.50x = 1,347,850.04
  5. Step 5: Solve for x
    x = 1,347,850.04/1,247.50
  6. Step 6: Final answer
    x = 1,080.44

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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.