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Finding the Fourth Proportional to 12,148.66, 18,216.78 and 7,991.02

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Solution

The fourth proportional to 12,148.66, 18,216.78 and 7,991.02 is: 11,982.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,148.66 : 18,216.78 = 7,991.02 : x
  2. Step 2: Convert to fraction form
    12,148.66/18,216.78 = 7,991.02/x
  3. Step 3: Cross multiply
    12,148.66x = 18,216.78 × 7,991.02
  4. Step 4: Simplify right side
    12,148.66x = 145,570,653.32
  5. Step 5: Solve for x
    x = 145,570,653.32/12,148.66
  6. Step 6: Final answer
    x = 11,982.45

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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.