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Finding the Fourth Proportional to 1,138.84, 1,707.04 and 813.22

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Solution

The fourth proportional to 1,138.84, 1,707.04 and 813.22 is: 1,218.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.84 : 1,707.04 = 813.22 : x
  2. Step 2: Convert to fraction form
    1,138.84/1,707.04 = 813.22/x
  3. Step 3: Cross multiply
    1,138.84x = 1,707.04 × 813.22
  4. Step 4: Simplify right side
    1,138.84x = 1,388,199.07
  5. Step 5: Solve for x
    x = 1,388,199.07/1,138.84
  6. Step 6: Final answer
    x = 1,218.96

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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.