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Finding the Fourth Proportional to 744.71, 1,117.13 and 257.75

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Solution

The fourth proportional to 744.71, 1,117.13 and 257.75 is: 386.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.71 : 1,117.13 = 257.75 : x
  2. Step 2: Convert to fraction form
    744.71/1,117.13 = 257.75/x
  3. Step 3: Cross multiply
    744.71x = 1,117.13 × 257.75
  4. Step 4: Simplify right side
    744.71x = 287,943.69
  5. Step 5: Solve for x
    x = 287,943.69/744.71
  6. Step 6: Final answer
    x = 386.65

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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.