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Finding the Fourth Proportional to 12,621.90, 17,435.90 and 11,957.61

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Solution

The fourth proportional to 12,621.90, 17,435.90 and 11,957.61 is: 16,518.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,621.90 : 17,435.90 = 11,957.61 : x
  2. Step 2: Convert to fraction form
    12,621.90/17,435.90 = 11,957.61/x
  3. Step 3: Cross multiply
    12,621.90x = 17,435.90 × 11,957.61
  4. Step 4: Simplify right side
    12,621.90x = 208,491,692.20
  5. Step 5: Solve for x
    x = 208,491,692.20/12,621.90
  6. Step 6: Final answer
    x = 16,518.25

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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.