Home / 20,838.20-31,208.70-20,420.60

Finding the Fourth Proportional to 20,838.20, 31,208.70 and 20,420.60

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Solution

The fourth proportional to 20,838.20, 31,208.70 and 20,420.60 is: 30,583.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,838.20 : 31,208.70 = 20,420.60 : x
  2. Step 2: Convert to fraction form
    20,838.20/31,208.70 = 20,420.60/x
  3. Step 3: Cross multiply
    20,838.20x = 31,208.70 × 20,420.60
  4. Step 4: Simplify right side
    20,838.20x = 637,300,379.22
  5. Step 5: Solve for x
    x = 637,300,379.22/20,838.20
  6. Step 6: Final answer
    x = 30,583.27

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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.