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Finding the Fourth Proportional to 12,639.93, 18,959.91 and 3,405.93

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Solution

The fourth proportional to 12,639.93, 18,959.91 and 3,405.93 is: 5,108.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.93 : 18,959.91 = 3,405.93 : x
  2. Step 2: Convert to fraction form
    12,639.93/18,959.91 = 3,405.93/x
  3. Step 3: Cross multiply
    12,639.93x = 18,959.91 × 3,405.93
  4. Step 4: Simplify right side
    12,639.93x = 64,576,109.24
  5. Step 5: Solve for x
    x = 64,576,109.24/12,639.93
  6. Step 6: Final answer
    x = 5,108.90

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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.