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Finding the Fourth Proportional to 20,783.60, 31,110.60 and 20,135.60

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Solution

The fourth proportional to 20,783.60, 31,110.60 and 20,135.60 is: 30,140.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.60 : 31,110.60 = 20,135.60 : x
  2. Step 2: Convert to fraction form
    20,783.60/31,110.60 = 20,135.60/x
  3. Step 3: Cross multiply
    20,783.60x = 31,110.60 × 20,135.60
  4. Step 4: Simplify right side
    20,783.60x = 626,430,597.36
  5. Step 5: Solve for x
    x = 626,430,597.36/20,783.60
  6. Step 6: Final answer
    x = 30,140.62

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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.