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Finding the Fourth Proportional to 744.16, 1,116.42 and 257.59

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Solution

The fourth proportional to 744.16, 1,116.42 and 257.59 is: 386.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.16 : 1,116.42 = 257.59 : x
  2. Step 2: Convert to fraction form
    744.16/1,116.42 = 257.59/x
  3. Step 3: Cross multiply
    744.16x = 1,116.42 × 257.59
  4. Step 4: Simplify right side
    744.16x = 287,578.63
  5. Step 5: Solve for x
    x = 287,578.63/744.16
  6. Step 6: Final answer
    x = 386.45

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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.