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Finding the Fourth Proportional to 8,612.63, 12,918.99 and 3,418.50

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Solution

The fourth proportional to 8,612.63, 12,918.99 and 3,418.50 is: 5,127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.63 : 12,918.99 = 3,418.50 : x
  2. Step 2: Convert to fraction form
    8,612.63/12,918.99 = 3,418.50/x
  3. Step 3: Cross multiply
    8,612.63x = 12,918.99 × 3,418.50
  4. Step 4: Simplify right side
    8,612.63x = 44,163,628.58
  5. Step 5: Solve for x
    x = 44,163,628.58/8,612.63
  6. Step 6: Final answer
    x = 5,127.78

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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.