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Finding the Fourth Proportional to 72,738.81, 100,345.67 and 47,243.37

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Solution

The fourth proportional to 72,738.81, 100,345.67 and 47,243.37 is: 65,173.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,738.81 : 100,345.67 = 47,243.37 : x
  2. Step 2: Convert to fraction form
    72,738.81/100,345.67 = 47,243.37/x
  3. Step 3: Cross multiply
    72,738.81x = 100,345.67 × 47,243.37
  4. Step 4: Simplify right side
    72,738.81x = 4,740,667,379.49
  5. Step 5: Solve for x
    x = 4,740,667,379.49/72,738.81
  6. Step 6: Final answer
    x = 65,173.84

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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.