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Finding the Fourth Proportional to 12,162.81, 16,786.29 and 7,129.01

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Solution

The fourth proportional to 12,162.81, 16,786.29 and 7,129.01 is: 9,838.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,162.81 : 16,786.29 = 7,129.01 : x
  2. Step 2: Convert to fraction form
    12,162.81/16,786.29 = 7,129.01/x
  3. Step 3: Cross multiply
    12,162.81x = 16,786.29 × 7,129.01
  4. Step 4: Simplify right side
    12,162.81x = 119,669,657.87
  5. Step 5: Solve for x
    x = 119,669,657.87/12,162.81
  6. Step 6: Final answer
    x = 9,838.98

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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.