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Finding the Fourth Proportional to 12,491.20, 18,736.80 and 11,762.20

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Solution

The fourth proportional to 12,491.20, 18,736.80 and 11,762.20 is: 17,643.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,491.20 : 18,736.80 = 11,762.20 : x
  2. Step 2: Convert to fraction form
    12,491.20/18,736.80 = 11,762.20/x
  3. Step 3: Cross multiply
    12,491.20x = 18,736.80 × 11,762.20
  4. Step 4: Simplify right side
    12,491.20x = 220,385,988.96
  5. Step 5: Solve for x
    x = 220,385,988.96/12,491.20
  6. Step 6: Final answer
    x = 17,643.30

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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.