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Finding the Fourth Proportional to 1,219.82, 1,683.26 and 688.77

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Solution

The fourth proportional to 1,219.82, 1,683.26 and 688.77 is: 950.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.82 : 1,683.26 = 688.77 : x
  2. Step 2: Convert to fraction form
    1,219.82/1,683.26 = 688.77/x
  3. Step 3: Cross multiply
    1,219.82x = 1,683.26 × 688.77
  4. Step 4: Simplify right side
    1,219.82x = 1,159,375.55
  5. Step 5: Solve for x
    x = 1,159,375.55/1,219.82
  6. Step 6: Final answer
    x = 950.45

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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.