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Finding the Fourth Proportional to 7,679.40, 11,519.28 and 2,749.40

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Solution

The fourth proportional to 7,679.40, 11,519.28 and 2,749.40 is: 4,124.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,679.40 : 11,519.28 = 2,749.40 : x
  2. Step 2: Convert to fraction form
    7,679.40/11,519.28 = 2,749.40/x
  3. Step 3: Cross multiply
    7,679.40x = 11,519.28 × 2,749.40
  4. Step 4: Simplify right side
    7,679.40x = 31,671,108.43
  5. Step 5: Solve for x
    x = 31,671,108.43/7,679.40
  6. Step 6: Final answer
    x = 4,124.16

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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.