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Finding the Fourth Proportional to 13,039.99, 18,009.95 and 12,006.63

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Solution

The fourth proportional to 13,039.99, 18,009.95 and 12,006.63 is: 16,582.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,039.99 : 18,009.95 = 12,006.63 : x
  2. Step 2: Convert to fraction form
    13,039.99/18,009.95 = 12,006.63/x
  3. Step 3: Cross multiply
    13,039.99x = 18,009.95 × 12,006.63
  4. Step 4: Simplify right side
    13,039.99x = 216,238,745.94
  5. Step 5: Solve for x
    x = 216,238,745.94/13,039.99
  6. Step 6: Final answer
    x = 16,582.74

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Double scale
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Similar ratio
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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.