Home / 1,219.14-1,681.80-721.59

Finding the Fourth Proportional to 1,219.14, 1,681.80 and 721.59

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Solution

The fourth proportional to 1,219.14, 1,681.80 and 721.59 is: 995.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.14 : 1,681.80 = 721.59 : x
  2. Step 2: Convert to fraction form
    1,219.14/1,681.80 = 721.59/x
  3. Step 3: Cross multiply
    1,219.14x = 1,681.80 × 721.59
  4. Step 4: Simplify right side
    1,219.14x = 1,213,570.06
  5. Step 5: Solve for x
    x = 1,213,570.06/1,219.14
  6. Step 6: Final answer
    x = 995.43

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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.