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Finding the Fourth Proportional to 718.82, 1,078.11 and 231.80

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Solution

The fourth proportional to 718.82, 1,078.11 and 231.80 is: 347.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.82 : 1,078.11 = 231.80 : x
  2. Step 2: Convert to fraction form
    718.82/1,078.11 = 231.80/x
  3. Step 3: Cross multiply
    718.82x = 1,078.11 × 231.80
  4. Step 4: Simplify right side
    718.82x = 249,900.51
  5. Step 5: Solve for x
    x = 249,900.51/718.82
  6. Step 6: Final answer
    x = 347.66

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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.