Home / 28,918.89-39,912.35-18,309.51

Finding the Fourth Proportional to 28,918.89, 39,912.35 and 18,309.51

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Solution

The fourth proportional to 28,918.89, 39,912.35 and 18,309.51 is: 25,269.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,918.89 : 39,912.35 = 18,309.51 : x
  2. Step 2: Convert to fraction form
    28,918.89/39,912.35 = 18,309.51/x
  3. Step 3: Cross multiply
    28,918.89x = 39,912.35 × 18,309.51
  4. Step 4: Simplify right side
    28,918.89x = 730,775,479.90
  5. Step 5: Solve for x
    x = 730,775,479.90/28,918.89
  6. Step 6: Final answer
    x = 25,269.83

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1.5x scale

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.