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Finding the Fourth Proportional to 1,243.22, 1,715.62 and 704.80

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Solution

The fourth proportional to 1,243.22, 1,715.62 and 704.80 is: 972.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.22 : 1,715.62 = 704.80 : x
  2. Step 2: Convert to fraction form
    1,243.22/1,715.62 = 704.80/x
  3. Step 3: Cross multiply
    1,243.22x = 1,715.62 × 704.80
  4. Step 4: Simplify right side
    1,243.22x = 1,209,168.98
  5. Step 5: Solve for x
    x = 1,209,168.98/1,243.22
  6. Step 6: Final answer
    x = 972.61

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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.