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Finding the Fourth Proportional to 12,958.60, 19,409.10 and 11,230.60

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Solution

The fourth proportional to 12,958.60, 19,409.10 and 11,230.60 is: 16,820.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,958.60 : 19,409.10 = 11,230.60 : x
  2. Step 2: Convert to fraction form
    12,958.60/19,409.10 = 11,230.60/x
  3. Step 3: Cross multiply
    12,958.60x = 19,409.10 × 11,230.60
  4. Step 4: Simplify right side
    12,958.60x = 217,975,838.46
  5. Step 5: Solve for x
    x = 217,975,838.46/12,958.60
  6. Step 6: Final answer
    x = 16,820.94

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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.