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Finding the Fourth Proportional to 38,636.81, 53,315.21 and 21,869.81

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Solution

The fourth proportional to 38,636.81, 53,315.21 and 21,869.81 is: 30,178.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,636.81 : 53,315.21 = 21,869.81 : x
  2. Step 2: Convert to fraction form
    38,636.81/53,315.21 = 21,869.81/x
  3. Step 3: Cross multiply
    38,636.81x = 53,315.21 × 21,869.81
  4. Step 4: Simplify right side
    38,636.81x = 1,165,993,512.81
  5. Step 5: Solve for x
    x = 1,165,993,512.81/38,636.81
  6. Step 6: Final answer
    x = 30,178.31

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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.