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Finding the Fourth Proportional to 39,951.80, 59,919.30 and 20,211.80

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Solution

The fourth proportional to 39,951.80, 59,919.30 and 20,211.80 is: 30,313.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,951.80 : 59,919.30 = 20,211.80 : x
  2. Step 2: Convert to fraction form
    39,951.80/59,919.30 = 20,211.80/x
  3. Step 3: Cross multiply
    39,951.80x = 59,919.30 × 20,211.80
  4. Step 4: Simplify right side
    39,951.80x = 1,211,076,907.74
  5. Step 5: Solve for x
    x = 1,211,076,907.74/39,951.80
  6. Step 6: Final answer
    x = 30,313.45

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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.