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Finding the Fourth Proportional to 20,148.40, 30,211.80 and 8,448.40

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Solution

The fourth proportional to 20,148.40, 30,211.80 and 8,448.40 is: 12,668.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,148.40 : 30,211.80 = 8,448.40 : x
  2. Step 2: Convert to fraction form
    20,148.40/30,211.80 = 8,448.40/x
  3. Step 3: Cross multiply
    20,148.40x = 30,211.80 × 8,448.40
  4. Step 4: Simplify right side
    20,148.40x = 255,241,371.12
  5. Step 5: Solve for x
    x = 255,241,371.12/20,148.40
  6. Step 6: Final answer
    x = 12,668.07

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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.