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Finding the Fourth Proportional to 2,778, 4,167.16 and 1,391.68

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Solution

The fourth proportional to 2,778, 4,167.16 and 1,391.68 is: 2,087.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778 : 4,167.16 = 1,391.68 : x
  2. Step 2: Convert to fraction form
    2,778/4,167.16 = 1,391.68/x
  3. Step 3: Cross multiply
    2,778x = 4,167.16 × 1,391.68
  4. Step 4: Simplify right side
    2,778x = 5,799,353.23
  5. Step 5: Solve for x
    x = 5,799,353.23/2,778
  6. Step 6: Final answer
    x = 2,087.60

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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.