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Finding the Fourth Proportional to 1,219.17, 1,682.39 and 688.04

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Solution

The fourth proportional to 1,219.17, 1,682.39 and 688.04 is: 949.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.17 : 1,682.39 = 688.04 : x
  2. Step 2: Convert to fraction form
    1,219.17/1,682.39 = 688.04/x
  3. Step 3: Cross multiply
    1,219.17x = 1,682.39 × 688.04
  4. Step 4: Simplify right side
    1,219.17x = 1,157,551.62
  5. Step 5: Solve for x
    x = 1,157,551.62/1,219.17
  6. Step 6: Final answer
    x = 949.46

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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.