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Finding the Fourth Proportional to 1,121.66, 1,682.98 and 428.54

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Solution

The fourth proportional to 1,121.66, 1,682.98 and 428.54 is: 643.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.66 : 1,682.98 = 428.54 : x
  2. Step 2: Convert to fraction form
    1,121.66/1,682.98 = 428.54/x
  3. Step 3: Cross multiply
    1,121.66x = 1,682.98 × 428.54
  4. Step 4: Simplify right side
    1,121.66x = 721,224.25
  5. Step 5: Solve for x
    x = 721,224.25/1,121.66
  6. Step 6: Final answer
    x = 643.00

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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.