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Finding the Fourth Proportional to 18,418.80, 27,628.20 and 10,513.20

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Solution

The fourth proportional to 18,418.80, 27,628.20 and 10,513.20 is: 15,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,418.80 : 27,628.20 = 10,513.20 : x
  2. Step 2: Convert to fraction form
    18,418.80/27,628.20 = 10,513.20/x
  3. Step 3: Cross multiply
    18,418.80x = 27,628.20 × 10,513.20
  4. Step 4: Simplify right side
    18,418.80x = 290,460,792.24
  5. Step 5: Solve for x
    x = 290,460,792.24/18,418.80
  6. Step 6: Final answer
    x = 15,769.80

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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.