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Finding the Fourth Proportional to 18,810.50, 25,949.43 and 12,439.58

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Solution

The fourth proportional to 18,810.50, 25,949.43 and 12,439.58 is: 17,160.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.50 : 25,949.43 = 12,439.58 : x
  2. Step 2: Convert to fraction form
    18,810.50/25,949.43 = 12,439.58/x
  3. Step 3: Cross multiply
    18,810.50x = 25,949.43 × 12,439.58
  4. Step 4: Simplify right side
    18,810.50x = 322,799,880.69
  5. Step 5: Solve for x
    x = 322,799,880.69/18,810.50
  6. Step 6: Final answer
    x = 17,160.63

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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.