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Finding the Fourth Proportional to 18,683.76, 25,784.46 and 11,128.38

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Solution

The fourth proportional to 18,683.76, 25,784.46 and 11,128.38 is: 15,357.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,683.76 : 25,784.46 = 11,128.38 : x
  2. Step 2: Convert to fraction form
    18,683.76/25,784.46 = 11,128.38/x
  3. Step 3: Cross multiply
    18,683.76x = 25,784.46 × 11,128.38
  4. Step 4: Simplify right side
    18,683.76x = 286,939,268.97
  5. Step 5: Solve for x
    x = 286,939,268.97/18,683.76
  6. Step 6: Final answer
    x = 15,357.68

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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.