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Finding the Fourth Proportional to 780.89, 1,171.13 and 233.12

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Solution

The fourth proportional to 780.89, 1,171.13 and 233.12 is: 349.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.89 : 1,171.13 = 233.12 : x
  2. Step 2: Convert to fraction form
    780.89/1,171.13 = 233.12/x
  3. Step 3: Cross multiply
    780.89x = 1,171.13 × 233.12
  4. Step 4: Simplify right side
    780.89x = 273,015.59
  5. Step 5: Solve for x
    x = 273,015.59/780.89
  6. Step 6: Final answer
    x = 349.62

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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.