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Finding the Fourth Proportional to 12,999.84, 19,499.70 and 3,139.08

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Solution

The fourth proportional to 12,999.84, 19,499.70 and 3,139.08 is: 4,708.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.84 : 19,499.70 = 3,139.08 : x
  2. Step 2: Convert to fraction form
    12,999.84/19,499.70 = 3,139.08/x
  3. Step 3: Cross multiply
    12,999.84x = 19,499.70 × 3,139.08
  4. Step 4: Simplify right side
    12,999.84x = 61,211,118.28
  5. Step 5: Solve for x
    x = 61,211,118.28/12,999.84
  6. Step 6: Final answer
    x = 4,708.61

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Similar ratio
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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.