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Finding the Fourth Proportional to 20,368.70, 30,353.01 and 19,699.78

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Solution

The fourth proportional to 20,368.70, 30,353.01 and 19,699.78 is: 29,356.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,368.70 : 30,353.01 = 19,699.78 : x
  2. Step 2: Convert to fraction form
    20,368.70/30,353.01 = 19,699.78/x
  3. Step 3: Cross multiply
    20,368.70x = 30,353.01 × 19,699.78
  4. Step 4: Simplify right side
    20,368.70x = 597,947,619.34
  5. Step 5: Solve for x
    x = 597,947,619.34/20,368.70
  6. Step 6: Final answer
    x = 29,356.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.