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Finding the Fourth Proportional to 744.87, 1,117.24 and 257.90

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Solution

The fourth proportional to 744.87, 1,117.24 and 257.90 is: 386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.87 : 1,117.24 = 257.90 : x
  2. Step 2: Convert to fraction form
    744.87/1,117.24 = 257.90/x
  3. Step 3: Cross multiply
    744.87x = 1,117.24 × 257.90
  4. Step 4: Simplify right side
    744.87x = 288,129.97
  5. Step 5: Solve for x
    x = 288,129.97/744.87
  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.