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Finding the Fourth Proportional to 72,420.75, 99,944.73 and 40,591.68

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Solution

The fourth proportional to 72,420.75, 99,944.73 and 40,591.68 is: 56,018.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,420.75 : 99,944.73 = 40,591.68 : x
  2. Step 2: Convert to fraction form
    72,420.75/99,944.73 = 40,591.68/x
  3. Step 3: Cross multiply
    72,420.75x = 99,944.73 × 40,591.68
  4. Step 4: Simplify right side
    72,420.75x = 4,056,924,497.85
  5. Step 5: Solve for x
    x = 4,056,924,497.85/72,420.75
  6. Step 6: Final answer
    x = 56,018.81

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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.