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Finding the Fourth Proportional to 12,642.80, 18,985.80 and 8,279.60

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Solution

The fourth proportional to 12,642.80, 18,985.80 and 8,279.60 is: 12,433.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,642.80 : 18,985.80 = 8,279.60 : x
  2. Step 2: Convert to fraction form
    12,642.80/18,985.80 = 8,279.60/x
  3. Step 3: Cross multiply
    12,642.80x = 18,985.80 × 8,279.60
  4. Step 4: Simplify right side
    12,642.80x = 157,194,829.68
  5. Step 5: Solve for x
    x = 157,194,829.68/12,642.80
  6. Step 6: Final answer
    x = 12,433.55

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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.