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Finding the Fourth Proportional to 19,112.67, 28,661.72 and 9,115.65

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Solution

The fourth proportional to 19,112.67, 28,661.72 and 9,115.65 is: 13,670.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,112.67 : 28,661.72 = 9,115.65 : x
  2. Step 2: Convert to fraction form
    19,112.67/28,661.72 = 9,115.65/x
  3. Step 3: Cross multiply
    19,112.67x = 28,661.72 × 9,115.65
  4. Step 4: Simplify right side
    19,112.67x = 261,270,162.34
  5. Step 5: Solve for x
    x = 261,270,162.34/19,112.67
  6. Step 6: Final answer
    x = 13,670.00

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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.