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Finding the Fourth Proportional to 1,230.55, 1,698 and 699.37

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Solution

The fourth proportional to 1,230.55, 1,698 and 699.37 is: 965.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.55 : 1,698 = 699.37 : x
  2. Step 2: Convert to fraction form
    1,230.55/1,698 = 699.37/x
  3. Step 3: Cross multiply
    1,230.55x = 1,698 × 699.37
  4. Step 4: Simplify right side
    1,230.55x = 1,187,530.26
  5. Step 5: Solve for x
    x = 1,187,530.26/1,230.55
  6. Step 6: Final answer
    x = 965.04

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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.