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Finding the Fourth Proportional to 8,908.40, 12,345.50 and 8,783.12

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Solution

The fourth proportional to 8,908.40, 12,345.50 and 8,783.12 is: 12,171.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,908.40 : 12,345.50 = 8,783.12 : x
  2. Step 2: Convert to fraction form
    8,908.40/12,345.50 = 8,783.12/x
  3. Step 3: Cross multiply
    8,908.40x = 12,345.50 × 8,783.12
  4. Step 4: Simplify right side
    8,908.40x = 108,432,007.96
  5. Step 5: Solve for x
    x = 108,432,007.96/8,908.40
  6. Step 6: Final answer
    x = 12,171.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.