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Finding the Fourth Proportional to 1,218.93, 1,681.97 and 721.45

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Solution

The fourth proportional to 1,218.93, 1,681.97 and 721.45 is: 995.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.93 : 1,681.97 = 721.45 : x
  2. Step 2: Convert to fraction form
    1,218.93/1,681.97 = 721.45/x
  3. Step 3: Cross multiply
    1,218.93x = 1,681.97 × 721.45
  4. Step 4: Simplify right side
    1,218.93x = 1,213,457.26
  5. Step 5: Solve for x
    x = 1,213,457.26/1,218.93
  6. Step 6: Final answer
    x = 995.51

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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.