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Finding the Fourth Proportional to 12,663.48, 18,993.76 and 3,428.76

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Solution

The fourth proportional to 12,663.48, 18,993.76 and 3,428.76 is: 5,142.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,663.48 : 18,993.76 = 3,428.76 : x
  2. Step 2: Convert to fraction form
    12,663.48/18,993.76 = 3,428.76/x
  3. Step 3: Cross multiply
    12,663.48x = 18,993.76 × 3,428.76
  4. Step 4: Simplify right side
    12,663.48x = 65,125,044.54
  5. Step 5: Solve for x
    x = 65,125,044.54/12,663.48
  6. Step 6: Final answer
    x = 5,142.74

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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.