Home / 20,120.40-30,148.20-16,815.60

Finding the Fourth Proportional to 20,120.40, 30,148.20 and 16,815.60

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Solution

The fourth proportional to 20,120.40, 30,148.20 and 16,815.60 is: 25,196.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.40 : 30,148.20 = 16,815.60 : x
  2. Step 2: Convert to fraction form
    20,120.40/30,148.20 = 16,815.60/x
  3. Step 3: Cross multiply
    20,120.40x = 30,148.20 × 16,815.60
  4. Step 4: Simplify right side
    20,120.40x = 506,960,071.92
  5. Step 5: Solve for x
    x = 506,960,071.92/20,120.40
  6. Step 6: Final answer
    x = 25,196.32

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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.