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Finding the Fourth Proportional to 20,364.98, 30,530.97 and 7,878.60

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Solution

The fourth proportional to 20,364.98, 30,530.97 and 7,878.60 is: 11,811.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,364.98 : 30,530.97 = 7,878.60 : x
  2. Step 2: Convert to fraction form
    20,364.98/30,530.97 = 7,878.60/x
  3. Step 3: Cross multiply
    20,364.98x = 30,530.97 × 7,878.60
  4. Step 4: Simplify right side
    20,364.98x = 240,541,300.24
  5. Step 5: Solve for x
    x = 240,541,300.24/20,364.98
  6. Step 6: Final answer
    x = 11,811.52

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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.