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Finding the Fourth Proportional to 20,967.81, 28,935.80 and 12,015.12

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Solution

The fourth proportional to 20,967.81, 28,935.80 and 12,015.12 is: 16,580.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,967.81 : 28,935.80 = 12,015.12 : x
  2. Step 2: Convert to fraction form
    20,967.81/28,935.80 = 12,015.12/x
  3. Step 3: Cross multiply
    20,967.81x = 28,935.80 × 12,015.12
  4. Step 4: Simplify right side
    20,967.81x = 347,667,109.30
  5. Step 5: Solve for x
    x = 347,667,109.30/20,967.81
  6. Step 6: Final answer
    x = 16,580.99

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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.