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Finding the Fourth Proportional to 7,892.12, 11,839.80 and 2,698.40

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Solution

The fourth proportional to 7,892.12, 11,839.80 and 2,698.40 is: 4,048.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,892.12 : 11,839.80 = 2,698.40 : x
  2. Step 2: Convert to fraction form
    7,892.12/11,839.80 = 2,698.40/x
  3. Step 3: Cross multiply
    7,892.12x = 11,839.80 × 2,698.40
  4. Step 4: Simplify right side
    7,892.12x = 31,948,457.12
  5. Step 5: Solve for x
    x = 31,948,457.12/7,892.12
  6. Step 6: Final answer
    x = 4,048.15

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1.5x scale

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.