Home / 11,370.78-15,661.32-9,880.38

Finding the Fourth Proportional to 11,370.78, 15,661.32 and 9,880.38

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Solution

The fourth proportional to 11,370.78, 15,661.32 and 9,880.38 is: 13,608.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,370.78 : 15,661.32 = 9,880.38 : x
  2. Step 2: Convert to fraction form
    11,370.78/15,661.32 = 9,880.38/x
  3. Step 3: Cross multiply
    11,370.78x = 15,661.32 × 9,880.38
  4. Step 4: Simplify right side
    11,370.78x = 154,739,792.90
  5. Step 5: Solve for x
    x = 154,739,792.90/11,370.78
  6. Step 6: Final answer
    x = 13,608.55

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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.