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Finding the Fourth Proportional to 5,274.77, 7,913.89 and 2,157.40

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Solution

The fourth proportional to 5,274.77, 7,913.89 and 2,157.40 is: 3,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,274.77 : 7,913.89 = 2,157.40 : x
  2. Step 2: Convert to fraction form
    5,274.77/7,913.89 = 2,157.40/x
  3. Step 3: Cross multiply
    5,274.77x = 7,913.89 × 2,157.40
  4. Step 4: Simplify right side
    5,274.77x = 17,073,401.11
  5. Step 5: Solve for x
    x = 17,073,401.11/5,274.77
  6. Step 6: Final answer
    x = 3,236.80

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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.