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Finding the Fourth Proportional to 2,860.65, 4,291.28 and 912.41

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Solution

The fourth proportional to 2,860.65, 4,291.28 and 912.41 is: 1,368.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,860.65 : 4,291.28 = 912.41 : x
  2. Step 2: Convert to fraction form
    2,860.65/4,291.28 = 912.41/x
  3. Step 3: Cross multiply
    2,860.65x = 4,291.28 × 912.41
  4. Step 4: Simplify right side
    2,860.65x = 3,915,406.78
  5. Step 5: Solve for x
    x = 3,915,406.78/2,860.65
  6. Step 6: Final answer
    x = 1,368.71

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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.