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Finding the Fourth Proportional to 72,620.90, 100,226.25 and 40,789.80

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Solution

The fourth proportional to 72,620.90, 100,226.25 and 40,789.80 is: 56,295.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,620.90 : 100,226.25 = 40,789.80 : x
  2. Step 2: Convert to fraction form
    72,620.90/100,226.25 = 40,789.80/x
  3. Step 3: Cross multiply
    72,620.90x = 100,226.25 × 40,789.80
  4. Step 4: Simplify right side
    72,620.90x = 4,088,208,692.25
  5. Step 5: Solve for x
    x = 4,088,208,692.25/72,620.90
  6. Step 6: Final answer
    x = 56,295.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.