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Finding the Fourth Proportional to 18,744.40, 25,879.20 and 11,681.20

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Solution

The fourth proportional to 18,744.40, 25,879.20 and 11,681.20 is: 16,127.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,744.40 : 25,879.20 = 11,681.20 : x
  2. Step 2: Convert to fraction form
    18,744.40/25,879.20 = 11,681.20/x
  3. Step 3: Cross multiply
    18,744.40x = 25,879.20 × 11,681.20
  4. Step 4: Simplify right side
    18,744.40x = 302,300,111.04
  5. Step 5: Solve for x
    x = 302,300,111.04/18,744.40
  6. Step 6: Final answer
    x = 16,127.49

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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.