Home / 1,398.23-2,089.82-1,221.15

Finding the Fourth Proportional to 1,398.23, 2,089.82 and 1,221.15

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Solution

The fourth proportional to 1,398.23, 2,089.82 and 1,221.15 is: 1,825.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.23 : 2,089.82 = 1,221.15 : x
  2. Step 2: Convert to fraction form
    1,398.23/2,089.82 = 1,221.15/x
  3. Step 3: Cross multiply
    1,398.23x = 2,089.82 × 1,221.15
  4. Step 4: Simplify right side
    1,398.23x = 2,551,967.14
  5. Step 5: Solve for x
    x = 2,551,967.14/1,398.23
  6. Step 6: Final answer
    x = 1,825.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.