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Finding the Fourth Proportional to 72,818.22, 100,489.21 and 40,987.86

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Solution

The fourth proportional to 72,818.22, 100,489.21 and 40,987.86 is: 56,563.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,818.22 : 100,489.21 = 40,987.86 : x
  2. Step 2: Convert to fraction form
    72,818.22/100,489.21 = 40,987.86/x
  3. Step 3: Cross multiply
    72,818.22x = 100,489.21 × 40,987.86
  4. Step 4: Simplify right side
    72,818.22x = 4,118,837,191.69
  5. Step 5: Solve for x
    x = 4,118,837,191.69/72,818.22
  6. Step 6: Final answer
    x = 56,563.27

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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.