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Finding the Fourth Proportional to 718.67, 1,078.12 and 231.61

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Solution

The fourth proportional to 718.67, 1,078.12 and 231.61 is: 347.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.67 : 1,078.12 = 231.61 : x
  2. Step 2: Convert to fraction form
    718.67/1,078.12 = 231.61/x
  3. Step 3: Cross multiply
    718.67x = 1,078.12 × 231.61
  4. Step 4: Simplify right side
    718.67x = 249,703.31
  5. Step 5: Solve for x
    x = 249,703.31/718.67
  6. Step 6: Final answer
    x = 347.45

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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.