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Finding the Fourth Proportional to 72,704.61, 100,323.63 and 40,431.15

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Solution

The fourth proportional to 72,704.61, 100,323.63 and 40,431.15 is: 55,790.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,704.61 : 100,323.63 = 40,431.15 : x
  2. Step 2: Convert to fraction form
    72,704.61/100,323.63 = 40,431.15/x
  3. Step 3: Cross multiply
    72,704.61x = 100,323.63 × 40,431.15
  4. Step 4: Simplify right side
    72,704.61x = 4,056,199,733.07
  5. Step 5: Solve for x
    x = 4,056,199,733.07/72,704.61
  6. Step 6: Final answer
    x = 55,790.13

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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.