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Finding the Fourth Proportional to 72,703.86, 100,340.37 and 40,872.80

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Solution

The fourth proportional to 72,703.86, 100,340.37 and 40,872.80 is: 56,409.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,703.86 : 100,340.37 = 40,872.80 : x
  2. Step 2: Convert to fraction form
    72,703.86/100,340.37 = 40,872.80/x
  3. Step 3: Cross multiply
    72,703.86x = 100,340.37 × 40,872.80
  4. Step 4: Simplify right side
    72,703.86x = 4,101,191,373.23
  5. Step 5: Solve for x
    x = 4,101,191,373.23/72,703.86
  6. Step 6: Final answer
    x = 56,409.54

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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.