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Finding the Fourth Proportional to 18,978.14, 26,189.70 and 10,480.80

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Solution

The fourth proportional to 18,978.14, 26,189.70 and 10,480.80 is: 14,463.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.14 : 26,189.70 = 10,480.80 : x
  2. Step 2: Convert to fraction form
    18,978.14/26,189.70 = 10,480.80/x
  3. Step 3: Cross multiply
    18,978.14x = 26,189.70 × 10,480.80
  4. Step 4: Simplify right side
    18,978.14x = 274,489,007.76
  5. Step 5: Solve for x
    x = 274,489,007.76/18,978.14
  6. Step 6: Final answer
    x = 14,463.43

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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.