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Finding the Fourth Proportional to 8,905.12, 12,289.12 and 5,179.12

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Solution

The fourth proportional to 8,905.12, 12,289.12 and 5,179.12 is: 7,147.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.12 : 12,289.12 = 5,179.12 : x
  2. Step 2: Convert to fraction form
    8,905.12/12,289.12 = 5,179.12/x
  3. Step 3: Cross multiply
    8,905.12x = 12,289.12 × 5,179.12
  4. Step 4: Simplify right side
    8,905.12x = 63,646,827.17
  5. Step 5: Solve for x
    x = 63,646,827.17/8,905.12
  6. Step 6: Final answer
    x = 7,147.22

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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.