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Finding the Fourth Proportional to 780.53, 1,170.77 and 318.29

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Solution

The fourth proportional to 780.53, 1,170.77 and 318.29 is: 477.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.53 : 1,170.77 = 318.29 : x
  2. Step 2: Convert to fraction form
    780.53/1,170.77 = 318.29/x
  3. Step 3: Cross multiply
    780.53x = 1,170.77 × 318.29
  4. Step 4: Simplify right side
    780.53x = 372,636.94
  5. Step 5: Solve for x
    x = 372,636.94/780.53
  6. Step 6: Final answer
    x = 477.42

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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.