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Finding the Fourth Proportional to 20,967.64, 28,935.36 and 12,015.32

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Solution

The fourth proportional to 20,967.64, 28,935.36 and 12,015.32 is: 16,581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,967.64 : 28,935.36 = 12,015.32 : x
  2. Step 2: Convert to fraction form
    20,967.64/28,935.36 = 12,015.32/x
  3. Step 3: Cross multiply
    20,967.64x = 28,935.36 × 12,015.32
  4. Step 4: Simplify right side
    20,967.64x = 347,667,609.72
  5. Step 5: Solve for x
    x = 347,667,609.72/20,967.64
  6. Step 6: Final answer
    x = 16,581.15

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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.