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Finding the Fourth Proportional to 72,705.67, 100,343.16 and 40,880.71

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Solution

The fourth proportional to 72,705.67, 100,343.16 and 40,880.71 is: 56,420.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,705.67 : 100,343.16 = 40,880.71 : x
  2. Step 2: Convert to fraction form
    72,705.67/100,343.16 = 40,880.71/x
  3. Step 3: Cross multiply
    72,705.67x = 100,343.16 × 40,880.71
  4. Step 4: Simplify right side
    72,705.67x = 4,102,099,749.87
  5. Step 5: Solve for x
    x = 4,102,099,749.87/72,705.67
  6. Step 6: Final answer
    x = 56,420.63

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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.