Home / 11,378.60-15,696.27-7,128.75

Finding the Fourth Proportional to 11,378.60, 15,696.27 and 7,128.75

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Solution

The fourth proportional to 11,378.60, 15,696.27 and 7,128.75 is: 9,833.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,378.60 : 15,696.27 = 7,128.75 : x
  2. Step 2: Convert to fraction form
    11,378.60/15,696.27 = 7,128.75/x
  3. Step 3: Cross multiply
    11,378.60x = 15,696.27 × 7,128.75
  4. Step 4: Simplify right side
    11,378.60x = 111,894,784.76
  5. Step 5: Solve for x
    x = 111,894,784.76/11,378.60
  6. Step 6: Final answer
    x = 9,833.79

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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.