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Finding the Fourth Proportional to 780.96, 1,170.24 and 396.48

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Solution

The fourth proportional to 780.96, 1,170.24 and 396.48 is: 594.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.96 : 1,170.24 = 396.48 : x
  2. Step 2: Convert to fraction form
    780.96/1,170.24 = 396.48/x
  3. Step 3: Cross multiply
    780.96x = 1,170.24 × 396.48
  4. Step 4: Simplify right side
    780.96x = 463,976.76
  5. Step 5: Solve for x
    x = 463,976.76/780.96
  6. Step 6: Final answer
    x = 594.11

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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.