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Finding the Fourth Proportional to 780.48, 1,171.44 and 369.90

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Solution

The fourth proportional to 780.48, 1,171.44 and 369.90 is: 555.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.48 : 1,171.44 = 369.90 : x
  2. Step 2: Convert to fraction form
    780.48/1,171.44 = 369.90/x
  3. Step 3: Cross multiply
    780.48x = 1,171.44 × 369.90
  4. Step 4: Simplify right side
    780.48x = 433,315.66
  5. Step 5: Solve for x
    x = 433,315.66/780.48
  6. Step 6: Final answer
    x = 555.19

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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.