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Finding the Fourth Proportional to 780.01, 1,170 and 369.19

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Solution

The fourth proportional to 780.01, 1,170 and 369.19 is: 553.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.01 : 1,170 = 369.19 : x
  2. Step 2: Convert to fraction form
    780.01/1,170 = 369.19/x
  3. Step 3: Cross multiply
    780.01x = 1,170 × 369.19
  4. Step 4: Simplify right side
    780.01x = 431,952.30
  5. Step 5: Solve for x
    x = 431,952.30/780.01
  6. Step 6: Final answer
    x = 553.78

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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.