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Finding the Fourth Proportional to 3,913.79, 5,401.02 and 2,121.32

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Solution

The fourth proportional to 3,913.79, 5,401.02 and 2,121.32 is: 2,927.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.79 : 5,401.02 = 2,121.32 : x
  2. Step 2: Convert to fraction form
    3,913.79/5,401.02 = 2,121.32/x
  3. Step 3: Cross multiply
    3,913.79x = 5,401.02 × 2,121.32
  4. Step 4: Simplify right side
    3,913.79x = 11,457,281.14
  5. Step 5: Solve for x
    x = 11,457,281.14/3,913.79
  6. Step 6: Final answer
    x = 2,927.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.