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Finding the Fourth Proportional to 12,208.60, 18,312.90 and 12,135.70

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Solution

The fourth proportional to 12,208.60, 18,312.90 and 12,135.70 is: 18,203.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,208.60 : 18,312.90 = 12,135.70 : x
  2. Step 2: Convert to fraction form
    12,208.60/18,312.90 = 12,135.70/x
  3. Step 3: Cross multiply
    12,208.60x = 18,312.90 × 12,135.70
  4. Step 4: Simplify right side
    12,208.60x = 222,239,860.53
  5. Step 5: Solve for x
    x = 222,239,860.53/12,208.60
  6. Step 6: Final answer
    x = 18,203.55

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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.