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Finding the Fourth Proportional to 1,203.91, 1,806.55 and 742.82

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Solution

The fourth proportional to 1,203.91, 1,806.55 and 742.82 is: 1,114.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.91 : 1,806.55 = 742.82 : x
  2. Step 2: Convert to fraction form
    1,203.91/1,806.55 = 742.82/x
  3. Step 3: Cross multiply
    1,203.91x = 1,806.55 × 742.82
  4. Step 4: Simplify right side
    1,203.91x = 1,341,930.58
  5. Step 5: Solve for x
    x = 1,341,930.58/1,203.91
  6. Step 6: Final answer
    x = 1,114.65

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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.