Home / 20,810.90-28,715.82-11,858.78

Finding the Fourth Proportional to 20,810.90, 28,715.82 and 11,858.78

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Solution

The fourth proportional to 20,810.90, 28,715.82 and 11,858.78 is: 16,363.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.90 : 28,715.82 = 11,858.78 : x
  2. Step 2: Convert to fraction form
    20,810.90/28,715.82 = 11,858.78/x
  3. Step 3: Cross multiply
    20,810.90x = 28,715.82 × 11,858.78
  4. Step 4: Simplify right side
    20,810.90x = 340,534,591.90
  5. Step 5: Solve for x
    x = 340,534,591.90/20,810.90
  6. Step 6: Final answer
    x = 16,363.28

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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.