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Finding the Fourth Proportional to 72,560.86, 100,128.54 and 40,723.66

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Solution

The fourth proportional to 72,560.86, 100,128.54 and 40,723.66 is: 56,195.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,560.86 : 100,128.54 = 40,723.66 : x
  2. Step 2: Convert to fraction form
    72,560.86/100,128.54 = 40,723.66/x
  3. Step 3: Cross multiply
    72,560.86x = 100,128.54 × 40,723.66
  4. Step 4: Simplify right side
    72,560.86x = 4,077,600,619.26
  5. Step 5: Solve for x
    x = 4,077,600,619.26/72,560.86
  6. Step 6: Final answer
    x = 56,195.59

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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.