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Finding the Fourth Proportional to 15,321.60, 21,140.01 and 9,351.09

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Solution

The fourth proportional to 15,321.60, 21,140.01 and 9,351.09 is: 12,902.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.60 : 21,140.01 = 9,351.09 : x
  2. Step 2: Convert to fraction form
    15,321.60/21,140.01 = 9,351.09/x
  3. Step 3: Cross multiply
    15,321.60x = 21,140.01 × 9,351.09
  4. Step 4: Simplify right side
    15,321.60x = 197,682,136.11
  5. Step 5: Solve for x
    x = 197,682,136.11/15,321.60
  6. Step 6: Final answer
    x = 12,902.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.