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Finding the Fourth Proportional to 1,219.61, 1,682.98 and 722.28

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Solution

The fourth proportional to 1,219.61, 1,682.98 and 722.28 is: 996.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.61 : 1,682.98 = 722.28 : x
  2. Step 2: Convert to fraction form
    1,219.61/1,682.98 = 722.28/x
  3. Step 3: Cross multiply
    1,219.61x = 1,682.98 × 722.28
  4. Step 4: Simplify right side
    1,219.61x = 1,215,587.30
  5. Step 5: Solve for x
    x = 1,215,587.30/1,219.61
  6. Step 6: Final answer
    x = 996.70

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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.