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Finding the Fourth Proportional to 18,921.51, 26,106.44 and 12,207.42

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Solution

The fourth proportional to 18,921.51, 26,106.44 and 12,207.42 is: 16,842.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.51 : 26,106.44 = 12,207.42 : x
  2. Step 2: Convert to fraction form
    18,921.51/26,106.44 = 12,207.42/x
  3. Step 3: Cross multiply
    18,921.51x = 26,106.44 × 12,207.42
  4. Step 4: Simplify right side
    18,921.51x = 318,692,216.75
  5. Step 5: Solve for x
    x = 318,692,216.75/18,921.51
  6. Step 6: Final answer
    x = 16,842.85

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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.