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Finding the Fourth Proportional to 18,958.86, 28,438.95 and 7,111.42

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Solution

The fourth proportional to 18,958.86, 28,438.95 and 7,111.42 is: 10,667.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.86 : 28,438.95 = 7,111.42 : x
  2. Step 2: Convert to fraction form
    18,958.86/28,438.95 = 7,111.42/x
  3. Step 3: Cross multiply
    18,958.86x = 28,438.95 × 7,111.42
  4. Step 4: Simplify right side
    18,958.86x = 202,241,313.36
  5. Step 5: Solve for x
    x = 202,241,313.36/18,958.86
  6. Step 6: Final answer
    x = 10,667.38

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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.