Home / 20,961.66-28,918.71-13,406.25

Finding the Fourth Proportional to 20,961.66, 28,918.71 and 13,406.25

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Solution

The fourth proportional to 20,961.66, 28,918.71 and 13,406.25 is: 18,495.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.66 : 28,918.71 = 13,406.25 : x
  2. Step 2: Convert to fraction form
    20,961.66/28,918.71 = 13,406.25/x
  3. Step 3: Cross multiply
    20,961.66x = 28,918.71 × 13,406.25
  4. Step 4: Simplify right side
    20,961.66x = 387,691,455.94
  5. Step 5: Solve for x
    x = 387,691,455.94/20,961.66
  6. Step 6: Final answer
    x = 18,495.26

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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.