Home / 13,137.80-18,130.60-7,169.78

Finding the Fourth Proportional to 13,137.80, 18,130.60 and 7,169.78

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Solution

The fourth proportional to 13,137.80, 18,130.60 and 7,169.78 is: 9,894.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.80 : 18,130.60 = 7,169.78 : x
  2. Step 2: Convert to fraction form
    13,137.80/18,130.60 = 7,169.78/x
  3. Step 3: Cross multiply
    13,137.80x = 18,130.60 × 7,169.78
  4. Step 4: Simplify right side
    13,137.80x = 129,992,413.27
  5. Step 5: Solve for x
    x = 129,992,413.27/13,137.80
  6. Step 6: Final answer
    x = 9,894.53

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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.