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Finding the Fourth Proportional to 2,908.40, 3,939.30 and 2,908.40

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Solution

The fourth proportional to 2,908.40, 3,939.30 and 2,908.40 is: 3,939.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,908.40 : 3,939.30 = 2,908.40 : x
  2. Step 2: Convert to fraction form
    2,908.40/3,939.30 = 2,908.40/x
  3. Step 3: Cross multiply
    2,908.40x = 3,939.30 × 2,908.40
  4. Step 4: Simplify right side
    2,908.40x = 11,457,060.12
  5. Step 5: Solve for x
    x = 11,457,060.12/2,908.40
  6. Step 6: Final answer
    x = 3,939.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.