Home / 28,379.88-42,579-18,538.40

Finding the Fourth Proportional to 28,379.88, 42,579 and 18,538.40

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Solution

The fourth proportional to 28,379.88, 42,579 and 18,538.40 is: 27,813.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.88 : 42,579 = 18,538.40 : x
  2. Step 2: Convert to fraction form
    28,379.88/42,579 = 18,538.40/x
  3. Step 3: Cross multiply
    28,379.88x = 42,579 × 18,538.40
  4. Step 4: Simplify right side
    28,379.88x = 789,346,533.60
  5. Step 5: Solve for x
    x = 789,346,533.60/28,379.88
  6. Step 6: Final answer
    x = 27,813.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.