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Finding the Fourth Proportional to 743.18, 1,113.89 and 255.96

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Solution

The fourth proportional to 743.18, 1,113.89 and 255.96 is: 383.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.18 : 1,113.89 = 255.96 : x
  2. Step 2: Convert to fraction form
    743.18/1,113.89 = 255.96/x
  3. Step 3: Cross multiply
    743.18x = 1,113.89 × 255.96
  4. Step 4: Simplify right side
    743.18x = 285,110.00
  5. Step 5: Solve for x
    x = 285,110.00/743.18
  6. Step 6: Final answer
    x = 383.64

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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.