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Finding the Fourth Proportional to 11,979.88, 17,970.12 and 4,188.69

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Solution

The fourth proportional to 11,979.88, 17,970.12 and 4,188.69 is: 6,283.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,979.88 : 17,970.12 = 4,188.69 : x
  2. Step 2: Convert to fraction form
    11,979.88/17,970.12 = 4,188.69/x
  3. Step 3: Cross multiply
    11,979.88x = 17,970.12 × 4,188.69
  4. Step 4: Simplify right side
    11,979.88x = 75,271,261.94
  5. Step 5: Solve for x
    x = 75,271,261.94/11,979.88
  6. Step 6: Final answer
    x = 6,283.14

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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.