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Finding the Fourth Proportional to 12,791.86, 17,651.16 and 7,125.18

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Solution

The fourth proportional to 12,791.86, 17,651.16 and 7,125.18 is: 9,831.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,791.86 : 17,651.16 = 7,125.18 : x
  2. Step 2: Convert to fraction form
    12,791.86/17,651.16 = 7,125.18/x
  3. Step 3: Cross multiply
    12,791.86x = 17,651.16 × 7,125.18
  4. Step 4: Simplify right side
    12,791.86x = 125,767,692.21
  5. Step 5: Solve for x
    x = 125,767,692.21/12,791.86
  6. Step 6: Final answer
    x = 9,831.85

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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.