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Finding the Fourth Proportional to 718.78, 1,078.19 and 231.87

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Solution

The fourth proportional to 718.78, 1,078.19 and 231.87 is: 347.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.78 : 1,078.19 = 231.87 : x
  2. Step 2: Convert to fraction form
    718.78/1,078.19 = 231.87/x
  3. Step 3: Cross multiply
    718.78x = 1,078.19 × 231.87
  4. Step 4: Simplify right side
    718.78x = 249,999.92
  5. Step 5: Solve for x
    x = 249,999.92/718.78
  6. Step 6: Final answer
    x = 347.81

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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.