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Finding the Fourth Proportional to 12,663.81, 18,995.85 and 3,898.71

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Solution

The fourth proportional to 12,663.81, 18,995.85 and 3,898.71 is: 5,848.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,663.81 : 18,995.85 = 3,898.71 : x
  2. Step 2: Convert to fraction form
    12,663.81/18,995.85 = 3,898.71/x
  3. Step 3: Cross multiply
    12,663.81x = 18,995.85 × 3,898.71
  4. Step 4: Simplify right side
    12,663.81x = 74,059,310.35
  5. Step 5: Solve for x
    x = 74,059,310.35/12,663.81
  6. Step 6: Final answer
    x = 5,848.11

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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.