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Finding the Fourth Proportional to 780.63, 1,170.96 and 232.80

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Solution

The fourth proportional to 780.63, 1,170.96 and 232.80 is: 349.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.63 : 1,170.96 = 232.80 : x
  2. Step 2: Convert to fraction form
    780.63/1,170.96 = 232.80/x
  3. Step 3: Cross multiply
    780.63x = 1,170.96 × 232.80
  4. Step 4: Simplify right side
    780.63x = 272,593.63
  5. Step 5: Solve for x
    x = 272,593.63/780.63
  6. Step 6: Final answer
    x = 349.20

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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.