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Finding the Fourth Proportional to 12,660.99, 18,994.78 and 7,400.49

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Solution

The fourth proportional to 12,660.99, 18,994.78 and 7,400.49 is: 11,102.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660.99 : 18,994.78 = 7,400.49 : x
  2. Step 2: Convert to fraction form
    12,660.99/18,994.78 = 7,400.49/x
  3. Step 3: Cross multiply
    12,660.99x = 18,994.78 × 7,400.49
  4. Step 4: Simplify right side
    12,660.99x = 140,570,650.46
  5. Step 5: Solve for x
    x = 140,570,650.46/12,660.99
  6. Step 6: Final answer
    x = 11,102.66

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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.