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Finding the Fourth Proportional to 12,639.43, 18,959.16 and 3,405.43

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Solution

The fourth proportional to 12,639.43, 18,959.16 and 3,405.43 is: 5,108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.43 : 18,959.16 = 3,405.43 : x
  2. Step 2: Convert to fraction form
    12,639.43/18,959.16 = 3,405.43/x
  3. Step 3: Cross multiply
    12,639.43x = 18,959.16 × 3,405.43
  4. Step 4: Simplify right side
    12,639.43x = 64,564,075.21
  5. Step 5: Solve for x
    x = 64,564,075.21/12,639.43
  6. Step 6: Final answer
    x = 5,108.15

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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.