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Finding the Fourth Proportional to 5,423.76, 8,135.68 and 1,961

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Solution

The fourth proportional to 5,423.76, 8,135.68 and 1,961 is: 2,941.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,423.76 : 8,135.68 = 1,961 : x
  2. Step 2: Convert to fraction form
    5,423.76/8,135.68 = 1,961/x
  3. Step 3: Cross multiply
    5,423.76x = 8,135.68 × 1,961
  4. Step 4: Simplify right side
    5,423.76x = 15,954,068.48
  5. Step 5: Solve for x
    x = 15,954,068.48/5,423.76
  6. Step 6: Final answer
    x = 2,941.51

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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.