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Finding the Fourth Proportional to 780.76, 1,171.18 and 267.72

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Solution

The fourth proportional to 780.76, 1,171.18 and 267.72 is: 401.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.76 : 1,171.18 = 267.72 : x
  2. Step 2: Convert to fraction form
    780.76/1,171.18 = 267.72/x
  3. Step 3: Cross multiply
    780.76x = 1,171.18 × 267.72
  4. Step 4: Simplify right side
    780.76x = 313,548.31
  5. Step 5: Solve for x
    x = 313,548.31/780.76
  6. Step 6: Final answer
    x = 401.59

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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.