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Finding the Fourth Proportional to 780.54, 1,170.60 and 369.27

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Solution

The fourth proportional to 780.54, 1,170.60 and 369.27 is: 553.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.54 : 1,170.60 = 369.27 : x
  2. Step 2: Convert to fraction form
    780.54/1,170.60 = 369.27/x
  3. Step 3: Cross multiply
    780.54x = 1,170.60 × 369.27
  4. Step 4: Simplify right side
    780.54x = 432,267.46
  5. Step 5: Solve for x
    x = 432,267.46/780.54
  6. Step 6: Final answer
    x = 553.81

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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.