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Finding the Fourth Proportional to 20,615.63, 30,836.70 and 19,119.96

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Solution

The fourth proportional to 20,615.63, 30,836.70 and 19,119.96 is: 28,599.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.63 : 30,836.70 = 19,119.96 : x
  2. Step 2: Convert to fraction form
    20,615.63/30,836.70 = 19,119.96/x
  3. Step 3: Cross multiply
    20,615.63x = 30,836.70 × 19,119.96
  4. Step 4: Simplify right side
    20,615.63x = 589,596,470.53
  5. Step 5: Solve for x
    x = 589,596,470.53/20,615.63
  6. Step 6: Final answer
    x = 28,599.50

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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.