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Finding the Fourth Proportional to 12,220.40, 18,330.60 and 11,491.40

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Solution

The fourth proportional to 12,220.40, 18,330.60 and 11,491.40 is: 17,237.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,220.40 : 18,330.60 = 11,491.40 : x
  2. Step 2: Convert to fraction form
    12,220.40/18,330.60 = 11,491.40/x
  3. Step 3: Cross multiply
    12,220.40x = 18,330.60 × 11,491.40
  4. Step 4: Simplify right side
    12,220.40x = 210,644,256.84
  5. Step 5: Solve for x
    x = 210,644,256.84/12,220.40
  6. Step 6: Final answer
    x = 17,237.10

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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.