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Finding the Fourth Proportional to 718.78, 1,078.28 and 231.72

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Solution

The fourth proportional to 718.78, 1,078.28 and 231.72 is: 347.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.78 : 1,078.28 = 231.72 : x
  2. Step 2: Convert to fraction form
    718.78/1,078.28 = 231.72/x
  3. Step 3: Cross multiply
    718.78x = 1,078.28 × 231.72
  4. Step 4: Simplify right side
    718.78x = 249,859.04
  5. Step 5: Solve for x
    x = 249,859.04/718.78
  6. Step 6: Final answer
    x = 347.62

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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.