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Finding the Fourth Proportional to 2,771, 4,157.14 and 947

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Solution

The fourth proportional to 2,771, 4,157.14 and 947 is: 1,420.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,771 : 4,157.14 = 947 : x
  2. Step 2: Convert to fraction form
    2,771/4,157.14 = 947/x
  3. Step 3: Cross multiply
    2,771x = 4,157.14 × 947
  4. Step 4: Simplify right side
    2,771x = 3,936,811.58
  5. Step 5: Solve for x
    x = 3,936,811.58/2,771
  6. Step 6: Final answer
    x = 1,420.72

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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.