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Finding the Fourth Proportional to 19,290.65, 28,938.09 and 6,139.94

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Solution

The fourth proportional to 19,290.65, 28,938.09 and 6,139.94 is: 9,210.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,290.65 : 28,938.09 = 6,139.94 : x
  2. Step 2: Convert to fraction form
    19,290.65/28,938.09 = 6,139.94/x
  3. Step 3: Cross multiply
    19,290.65x = 28,938.09 × 6,139.94
  4. Step 4: Simplify right side
    19,290.65x = 177,677,991.62
  5. Step 5: Solve for x
    x = 177,677,991.62/19,290.65
  6. Step 6: Final answer
    x = 9,210.58

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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.