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Finding the Fourth Proportional to 13,920.42, 20,860.24 and 7,979.07

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Solution

The fourth proportional to 13,920.42, 20,860.24 and 7,979.07 is: 11,956.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.42 : 20,860.24 = 7,979.07 : x
  2. Step 2: Convert to fraction form
    13,920.42/20,860.24 = 7,979.07/x
  3. Step 3: Cross multiply
    13,920.42x = 20,860.24 × 7,979.07
  4. Step 4: Simplify right side
    13,920.42x = 166,445,315.18
  5. Step 5: Solve for x
    x = 166,445,315.18/13,920.42
  6. Step 6: Final answer
    x = 11,956.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.