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Finding the Fourth Proportional to 12,678.72, 19,017.72 and 4,889.22

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Solution

The fourth proportional to 12,678.72, 19,017.72 and 4,889.22 is: 7,333.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.72 : 19,017.72 = 4,889.22 : x
  2. Step 2: Convert to fraction form
    12,678.72/19,017.72 = 4,889.22/x
  3. Step 3: Cross multiply
    12,678.72x = 19,017.72 × 4,889.22
  4. Step 4: Simplify right side
    12,678.72x = 92,981,816.98
  5. Step 5: Solve for x
    x = 92,981,816.98/12,678.72
  6. Step 6: Final answer
    x = 7,333.69

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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.