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Finding the Fourth Proportional to 719.82, 1,079.53 and 257.54

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Solution

The fourth proportional to 719.82, 1,079.53 and 257.54 is: 386.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.82 : 1,079.53 = 257.54 : x
  2. Step 2: Convert to fraction form
    719.82/1,079.53 = 257.54/x
  3. Step 3: Cross multiply
    719.82x = 1,079.53 × 257.54
  4. Step 4: Simplify right side
    719.82x = 278,016.11
  5. Step 5: Solve for x
    x = 278,016.11/719.82
  6. Step 6: Final answer
    x = 386.23

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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.