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Finding the Fourth Proportional to 12,479.78, 17,222.79 and 6,815.05

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Solution

The fourth proportional to 12,479.78, 17,222.79 and 6,815.05 is: 9,405.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.78 : 17,222.79 = 6,815.05 : x
  2. Step 2: Convert to fraction form
    12,479.78/17,222.79 = 6,815.05/x
  3. Step 3: Cross multiply
    12,479.78x = 17,222.79 × 6,815.05
  4. Step 4: Simplify right side
    12,479.78x = 117,374,192.03
  5. Step 5: Solve for x
    x = 117,374,192.03/12,479.78
  6. Step 6: Final answer
    x = 9,405.15

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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.