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Finding the Fourth Proportional to 718.90, 1,078.52 and 231.96

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Solution

The fourth proportional to 718.90, 1,078.52 and 231.96 is: 347.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.90 : 1,078.52 = 231.96 : x
  2. Step 2: Convert to fraction form
    718.90/1,078.52 = 231.96/x
  3. Step 3: Cross multiply
    718.90x = 1,078.52 × 231.96
  4. Step 4: Simplify right side
    718.90x = 250,168.11
  5. Step 5: Solve for x
    x = 250,168.11/718.90
  6. Step 6: Final answer
    x = 347.99

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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.