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Finding the Fourth Proportional to 72,939, 100,655.88 and 39,405

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Solution

The fourth proportional to 72,939, 100,655.88 and 39,405 is: 54,378.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939 : 100,655.88 = 39,405 : x
  2. Step 2: Convert to fraction form
    72,939/100,655.88 = 39,405/x
  3. Step 3: Cross multiply
    72,939x = 100,655.88 × 39,405
  4. Step 4: Simplify right side
    72,939x = 3,966,344,951.40
  5. Step 5: Solve for x
    x = 3,966,344,951.40/72,939
  6. Step 6: Final answer
    x = 54,378.93

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.