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Finding the Fourth Proportional to 72,939.50, 100,656.51 and 39,405.50

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Solution

The fourth proportional to 72,939.50, 100,656.51 and 39,405.50 is: 54,379.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.50 : 100,656.51 = 39,405.50 : x
  2. Step 2: Convert to fraction form
    72,939.50/100,656.51 = 39,405.50/x
  3. Step 3: Cross multiply
    72,939.50x = 100,656.51 × 39,405.50
  4. Step 4: Simplify right side
    72,939.50x = 3,966,420,104.81
  5. Step 5: Solve for x
    x = 3,966,420,104.81/72,939.50
  6. Step 6: Final answer
    x = 54,379.59

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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.