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Finding the Fourth Proportional to 1,219.08, 1,681.84 and 721.61

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Solution

The fourth proportional to 1,219.08, 1,681.84 and 721.61 is: 995.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.08 : 1,681.84 = 721.61 : x
  2. Step 2: Convert to fraction form
    1,219.08/1,681.84 = 721.61/x
  3. Step 3: Cross multiply
    1,219.08x = 1,681.84 × 721.61
  4. Step 4: Simplify right side
    1,219.08x = 1,213,632.56
  5. Step 5: Solve for x
    x = 1,213,632.56/1,219.08
  6. Step 6: Final answer
    x = 995.53

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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.