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Finding the Fourth Proportional to 780.45, 1,170.78 and 232.56

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Solution

The fourth proportional to 780.45, 1,170.78 and 232.56 is: 348.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.45 : 1,170.78 = 232.56 : x
  2. Step 2: Convert to fraction form
    780.45/1,170.78 = 232.56/x
  3. Step 3: Cross multiply
    780.45x = 1,170.78 × 232.56
  4. Step 4: Simplify right side
    780.45x = 272,276.60
  5. Step 5: Solve for x
    x = 272,276.60/780.45
  6. Step 6: Final answer
    x = 348.87

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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.