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Finding the Fourth Proportional to 18,939.72, 26,133.84 and 10,980.30

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Solution

The fourth proportional to 18,939.72, 26,133.84 and 10,980.30 is: 15,151.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.72 : 26,133.84 = 10,980.30 : x
  2. Step 2: Convert to fraction form
    18,939.72/26,133.84 = 10,980.30/x
  3. Step 3: Cross multiply
    18,939.72x = 26,133.84 × 10,980.30
  4. Step 4: Simplify right side
    18,939.72x = 286,957,403.35
  5. Step 5: Solve for x
    x = 286,957,403.35/18,939.72
  6. Step 6: Final answer
    x = 15,151.09

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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.