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Finding the Fourth Proportional to 12,249.81, 16,905.99 and 7,215.61

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Solution

The fourth proportional to 12,249.81, 16,905.99 and 7,215.61 is: 9,958.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,249.81 : 16,905.99 = 7,215.61 : x
  2. Step 2: Convert to fraction form
    12,249.81/16,905.99 = 7,215.61/x
  3. Step 3: Cross multiply
    12,249.81x = 16,905.99 × 7,215.61
  4. Step 4: Simplify right side
    12,249.81x = 121,987,038.11
  5. Step 5: Solve for x
    x = 121,987,038.11/12,249.81
  6. Step 6: Final answer
    x = 9,958.28

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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.