Home / 28,705.78-39,620.64-18,109.90

Finding the Fourth Proportional to 28,705.78, 39,620.64 and 18,109.90

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Solution

The fourth proportional to 28,705.78, 39,620.64 and 18,109.90 is: 24,995.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,705.78 : 39,620.64 = 18,109.90 : x
  2. Step 2: Convert to fraction form
    28,705.78/39,620.64 = 18,109.90/x
  3. Step 3: Cross multiply
    28,705.78x = 39,620.64 × 18,109.90
  4. Step 4: Simplify right side
    28,705.78x = 717,525,828.34
  5. Step 5: Solve for x
    x = 717,525,828.34/28,705.78
  6. Step 6: Final answer
    x = 24,995.87

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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.