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Finding the Fourth Proportional to 744.82, 1,117.50 and 257.91

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Solution

The fourth proportional to 744.82, 1,117.50 and 257.91 is: 386.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.82 : 1,117.50 = 257.91 : x
  2. Step 2: Convert to fraction form
    744.82/1,117.50 = 257.91/x
  3. Step 3: Cross multiply
    744.82x = 1,117.50 × 257.91
  4. Step 4: Simplify right side
    744.82x = 288,212.41
  5. Step 5: Solve for x
    x = 288,212.41/744.82
  6. Step 6: Final answer
    x = 386.96

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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.