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Finding the Fourth Proportional to 744.68, 1,116.78 and 257.88

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Solution

The fourth proportional to 744.68, 1,116.78 and 257.88 is: 386.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.68 : 1,116.78 = 257.88 : x
  2. Step 2: Convert to fraction form
    744.68/1,116.78 = 257.88/x
  3. Step 3: Cross multiply
    744.68x = 1,116.78 × 257.88
  4. Step 4: Simplify right side
    744.68x = 287,995.23
  5. Step 5: Solve for x
    x = 287,995.23/744.68
  6. Step 6: Final answer
    x = 386.74

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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.