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Finding the Fourth Proportional to 7,107.79, 9,809.35 and 3,921.38

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Solution

The fourth proportional to 7,107.79, 9,809.35 and 3,921.38 is: 5,411.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,107.79 : 9,809.35 = 3,921.38 : x
  2. Step 2: Convert to fraction form
    7,107.79/9,809.35 = 3,921.38/x
  3. Step 3: Cross multiply
    7,107.79x = 9,809.35 × 3,921.38
  4. Step 4: Simplify right side
    7,107.79x = 38,466,188.90
  5. Step 5: Solve for x
    x = 38,466,188.90/7,107.79
  6. Step 6: Final answer
    x = 5,411.84

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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.