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Finding the Fourth Proportional to 2,860.64, 4,291.19 and 780.82

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Solution

The fourth proportional to 2,860.64, 4,291.19 and 780.82 is: 1,171.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,860.64 : 4,291.19 = 780.82 : x
  2. Step 2: Convert to fraction form
    2,860.64/4,291.19 = 780.82/x
  3. Step 3: Cross multiply
    2,860.64x = 4,291.19 × 780.82
  4. Step 4: Simplify right side
    2,860.64x = 3,350,638.20
  5. Step 5: Solve for x
    x = 3,350,638.20/2,860.64
  6. Step 6: Final answer
    x = 1,171.29

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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.