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Finding the Fourth Proportional to 72,177.67, 99,596.49 and 39,907.90

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Solution

The fourth proportional to 72,177.67, 99,596.49 and 39,907.90 is: 55,068.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,177.67 : 99,596.49 = 39,907.90 : x
  2. Step 2: Convert to fraction form
    72,177.67/99,596.49 = 39,907.90/x
  3. Step 3: Cross multiply
    72,177.67x = 99,596.49 × 39,907.90
  4. Step 4: Simplify right side
    72,177.67x = 3,974,686,265.29
  5. Step 5: Solve for x
    x = 3,974,686,265.29/72,177.67
  6. Step 6: Final answer
    x = 55,068.09

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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.