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Finding the Fourth Proportional to 1,219.67, 1,683.09 and 688.58

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Solution

The fourth proportional to 1,219.67, 1,683.09 and 688.58 is: 950.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.67 : 1,683.09 = 688.58 : x
  2. Step 2: Convert to fraction form
    1,219.67/1,683.09 = 688.58/x
  3. Step 3: Cross multiply
    1,219.67x = 1,683.09 × 688.58
  4. Step 4: Simplify right side
    1,219.67x = 1,158,933.70
  5. Step 5: Solve for x
    x = 1,158,933.70/1,219.67
  6. Step 6: Final answer
    x = 950.21

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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.