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Finding the Fourth Proportional to 12,791.78, 17,643.62 and 7,487.65

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Solution

The fourth proportional to 12,791.78, 17,643.62 and 7,487.65 is: 10,327.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,791.78 : 17,643.62 = 7,487.65 : x
  2. Step 2: Convert to fraction form
    12,791.78/17,643.62 = 7,487.65/x
  3. Step 3: Cross multiply
    12,791.78x = 17,643.62 × 7,487.65
  4. Step 4: Simplify right side
    12,791.78x = 132,109,225.90
  5. Step 5: Solve for x
    x = 132,109,225.90/12,791.78
  6. Step 6: Final answer
    x = 10,327.67

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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.