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Finding the Fourth Proportional to 72,469.70, 100,008.20 and 40,638.62

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Solution

The fourth proportional to 72,469.70, 100,008.20 and 40,638.62 is: 56,081.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,469.70 : 100,008.20 = 40,638.62 : x
  2. Step 2: Convert to fraction form
    72,469.70/100,008.20 = 40,638.62/x
  3. Step 3: Cross multiply
    72,469.70x = 100,008.20 × 40,638.62
  4. Step 4: Simplify right side
    72,469.70x = 4,064,195,236.68
  5. Step 5: Solve for x
    x = 4,064,195,236.68/72,469.70
  6. Step 6: Final answer
    x = 56,081.30

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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.