Home / 1,218.24-1,681.29-721.04

Finding the Fourth Proportional to 1,218.24, 1,681.29 and 721.04

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Solution

The fourth proportional to 1,218.24, 1,681.29 and 721.04 is: 995.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.24 : 1,681.29 = 721.04 : x
  2. Step 2: Convert to fraction form
    1,218.24/1,681.29 = 721.04/x
  3. Step 3: Cross multiply
    1,218.24x = 1,681.29 × 721.04
  4. Step 4: Simplify right side
    1,218.24x = 1,212,268.94
  5. Step 5: Solve for x
    x = 1,212,268.94/1,218.24
  6. Step 6: Final answer
    x = 995.10

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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.