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Finding the Fourth Proportional to 15,344.92, 21,187.90 and 11,981.90

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Solution

The fourth proportional to 15,344.92, 21,187.90 and 11,981.90 is: 16,544.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,344.92 : 21,187.90 = 11,981.90 : x
  2. Step 2: Convert to fraction form
    15,344.92/21,187.90 = 11,981.90/x
  3. Step 3: Cross multiply
    15,344.92x = 21,187.90 × 11,981.90
  4. Step 4: Simplify right side
    15,344.92x = 253,871,287.50
  5. Step 5: Solve for x
    x = 253,871,287.50/15,344.92
  6. Step 6: Final answer
    x = 16,544.32

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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.