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Finding the Fourth Proportional to 7,490.60, 11,238.60 and 3,109.40

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Solution

The fourth proportional to 7,490.60, 11,238.60 and 3,109.40 is: 4,665.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,490.60 : 11,238.60 = 3,109.40 : x
  2. Step 2: Convert to fraction form
    7,490.60/11,238.60 = 3,109.40/x
  3. Step 3: Cross multiply
    7,490.60x = 11,238.60 × 3,109.40
  4. Step 4: Simplify right side
    7,490.60x = 34,945,302.84
  5. Step 5: Solve for x
    x = 34,945,302.84/7,490.60
  6. Step 6: Final answer
    x = 4,665.22

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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.