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Finding the Fourth Proportional to 18,388.60, 27,569.40 and 7,289.80

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Solution

The fourth proportional to 18,388.60, 27,569.40 and 7,289.80 is: 10,929.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,388.60 : 27,569.40 = 7,289.80 : x
  2. Step 2: Convert to fraction form
    18,388.60/27,569.40 = 7,289.80/x
  3. Step 3: Cross multiply
    18,388.60x = 27,569.40 × 7,289.80
  4. Step 4: Simplify right side
    18,388.60x = 200,975,412.12
  5. Step 5: Solve for x
    x = 200,975,412.12/18,388.60
  6. Step 6: Final answer
    x = 10,929.35

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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.