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Finding the Fourth Proportional to 28,099.81, 38,777.11 and 15,353.07

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Solution

The fourth proportional to 28,099.81, 38,777.11 and 15,353.07 is: 21,186.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,099.81 : 38,777.11 = 15,353.07 : x
  2. Step 2: Convert to fraction form
    28,099.81/38,777.11 = 15,353.07/x
  3. Step 3: Cross multiply
    28,099.81x = 38,777.11 × 15,353.07
  4. Step 4: Simplify right side
    28,099.81x = 595,347,684.23
  5. Step 5: Solve for x
    x = 595,347,684.23/28,099.81
  6. Step 6: Final answer
    x = 21,186.89

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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.