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Finding the Fourth Proportional to 18,918.96, 28,368.71 and 10,161.24

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Solution

The fourth proportional to 18,918.96, 28,368.71 and 10,161.24 is: 15,236.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.96 : 28,368.71 = 10,161.24 : x
  2. Step 2: Convert to fraction form
    18,918.96/28,368.71 = 10,161.24/x
  3. Step 3: Cross multiply
    18,918.96x = 28,368.71 × 10,161.24
  4. Step 4: Simplify right side
    18,918.96x = 288,261,208.87
  5. Step 5: Solve for x
    x = 288,261,208.87/18,918.96
  6. Step 6: Final answer
    x = 15,236.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.