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Finding the Fourth Proportional to 1,220.36, 1,684.10 and 723.25

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Solution

The fourth proportional to 1,220.36, 1,684.10 and 723.25 is: 998.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.36 : 1,684.10 = 723.25 : x
  2. Step 2: Convert to fraction form
    1,220.36/1,684.10 = 723.25/x
  3. Step 3: Cross multiply
    1,220.36x = 1,684.10 × 723.25
  4. Step 4: Simplify right side
    1,220.36x = 1,218,022.92
  5. Step 5: Solve for x
    x = 1,218,022.92/1,220.36
  6. Step 6: Final answer
    x = 998.08

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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.