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Finding the Fourth Proportional to 744.85, 1,117.23 and 257.89

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Solution

The fourth proportional to 744.85, 1,117.23 and 257.89 is: 386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.85 : 1,117.23 = 257.89 : x
  2. Step 2: Convert to fraction form
    744.85/1,117.23 = 257.89/x
  3. Step 3: Cross multiply
    744.85x = 1,117.23 × 257.89
  4. Step 4: Simplify right side
    744.85x = 288,122.44
  5. Step 5: Solve for x
    x = 288,122.44/744.85
  6. Step 6: Final answer
    x = 386.82

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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.