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Finding the Fourth Proportional to 1,218.24, 1,827.35 and 669.21

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Solution

The fourth proportional to 1,218.24, 1,827.35 and 669.21 is: 1,003.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.24 : 1,827.35 = 669.21 : x
  2. Step 2: Convert to fraction form
    1,218.24/1,827.35 = 669.21/x
  3. Step 3: Cross multiply
    1,218.24x = 1,827.35 × 669.21
  4. Step 4: Simplify right side
    1,218.24x = 1,222,871.76
  5. Step 5: Solve for x
    x = 1,222,871.76/1,218.24
  6. Step 6: Final answer
    x = 1,003.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.