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Finding the Fourth Proportional to 18,639.99, 27,907.67 and 13,981.68

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Solution

The fourth proportional to 18,639.99, 27,907.67 and 13,981.68 is: 20,933.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.99 : 27,907.67 = 13,981.68 : x
  2. Step 2: Convert to fraction form
    18,639.99/27,907.67 = 13,981.68/x
  3. Step 3: Cross multiply
    18,639.99x = 27,907.67 × 13,981.68
  4. Step 4: Simplify right side
    18,639.99x = 390,196,146.44
  5. Step 5: Solve for x
    x = 390,196,146.44/18,639.99
  6. Step 6: Final answer
    x = 20,933.28

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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.