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Finding the Fourth Proportional to 18,681.92, 25,780 and 11,608.28

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Solution

The fourth proportional to 18,681.92, 25,780 and 11,608.28 is: 16,018.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681.92 : 25,780 = 11,608.28 : x
  2. Step 2: Convert to fraction form
    18,681.92/25,780 = 11,608.28/x
  3. Step 3: Cross multiply
    18,681.92x = 25,780 × 11,608.28
  4. Step 4: Simplify right side
    18,681.92x = 299,261,458.40
  5. Step 5: Solve for x
    x = 299,261,458.40/18,681.92
  6. Step 6: Final answer
    x = 16,018.77

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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.