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Finding the Fourth Proportional to 18,921.67, 28,353.65 and 9,047.36

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Solution

The fourth proportional to 18,921.67, 28,353.65 and 9,047.36 is: 13,557.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.67 : 28,353.65 = 9,047.36 : x
  2. Step 2: Convert to fraction form
    18,921.67/28,353.65 = 9,047.36/x
  3. Step 3: Cross multiply
    18,921.67x = 28,353.65 × 9,047.36
  4. Step 4: Simplify right side
    18,921.67x = 256,525,704.51
  5. Step 5: Solve for x
    x = 256,525,704.51/18,921.67
  6. Step 6: Final answer
    x = 13,557.25

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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.