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Finding the Fourth Proportional to 12,712.72, 19,071.60 and 4,921.60

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Solution

The fourth proportional to 12,712.72, 19,071.60 and 4,921.60 is: 7,383.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,712.72 : 19,071.60 = 4,921.60 : x
  2. Step 2: Convert to fraction form
    12,712.72/19,071.60 = 4,921.60/x
  3. Step 3: Cross multiply
    12,712.72x = 19,071.60 × 4,921.60
  4. Step 4: Simplify right side
    12,712.72x = 93,862,786.56
  5. Step 5: Solve for x
    x = 93,862,786.56/12,712.72
  6. Step 6: Final answer
    x = 7,383.38

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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.