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Finding the Fourth Proportional to 21,220.56, 31,810.08 and 11,865.12

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Solution

The fourth proportional to 21,220.56, 31,810.08 and 11,865.12 is: 17,786.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.56 : 31,810.08 = 11,865.12 : x
  2. Step 2: Convert to fraction form
    21,220.56/31,810.08 = 11,865.12/x
  3. Step 3: Cross multiply
    21,220.56x = 31,810.08 × 11,865.12
  4. Step 4: Simplify right side
    21,220.56x = 377,430,416.41
  5. Step 5: Solve for x
    x = 377,430,416.41/21,220.56
  6. Step 6: Final answer
    x = 17,786.07

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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.