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Finding the Fourth Proportional to 18,665.78, 25,761.21 and 10,706.45

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Solution

The fourth proportional to 18,665.78, 25,761.21 and 10,706.45 is: 14,776.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.78 : 25,761.21 = 10,706.45 : x
  2. Step 2: Convert to fraction form
    18,665.78/25,761.21 = 10,706.45/x
  3. Step 3: Cross multiply
    18,665.78x = 25,761.21 × 10,706.45
  4. Step 4: Simplify right side
    18,665.78x = 275,811,106.80
  5. Step 5: Solve for x
    x = 275,811,106.80/18,665.78
  6. Step 6: Final answer
    x = 14,776.30

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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.