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Finding the Fourth Proportional to 72,988.85, 100,724.64 and 39,454.85

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Solution

The fourth proportional to 72,988.85, 100,724.64 and 39,454.85 is: 54,447.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,988.85 : 100,724.64 = 39,454.85 : x
  2. Step 2: Convert to fraction form
    72,988.85/100,724.64 = 39,454.85/x
  3. Step 3: Cross multiply
    72,988.85x = 100,724.64 × 39,454.85
  4. Step 4: Simplify right side
    72,988.85x = 3,974,075,562.50
  5. Step 5: Solve for x
    x = 3,974,075,562.50/72,988.85
  6. Step 6: Final answer
    x = 54,447.71

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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.