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Finding the Fourth Proportional to 18,708.36, 28,035 and 12,778.08

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Solution

The fourth proportional to 18,708.36, 28,035 and 12,778.08 is: 19,148.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.36 : 28,035 = 12,778.08 : x
  2. Step 2: Convert to fraction form
    18,708.36/28,035 = 12,778.08/x
  3. Step 3: Cross multiply
    18,708.36x = 28,035 × 12,778.08
  4. Step 4: Simplify right side
    18,708.36x = 358,233,472.80
  5. Step 5: Solve for x
    x = 358,233,472.80/18,708.36
  6. Step 6: Final answer
    x = 19,148.31

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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.