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Finding the Fourth Proportional to 2,886.23, 4,329.50 and 911.90

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Solution

The fourth proportional to 2,886.23, 4,329.50 and 911.90 is: 1,367.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,886.23 : 4,329.50 = 911.90 : x
  2. Step 2: Convert to fraction form
    2,886.23/4,329.50 = 911.90/x
  3. Step 3: Cross multiply
    2,886.23x = 4,329.50 × 911.90
  4. Step 4: Simplify right side
    2,886.23x = 3,948,071.05
  5. Step 5: Solve for x
    x = 3,948,071.05/2,886.23
  6. Step 6: Final answer
    x = 1,367.90

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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.