Home / 20,810.70-28,719.36-11,858.31

Finding the Fourth Proportional to 20,810.70, 28,719.36 and 11,858.31

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Solution

The fourth proportional to 20,810.70, 28,719.36 and 11,858.31 is: 16,364.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.70 : 28,719.36 = 11,858.31 : x
  2. Step 2: Convert to fraction form
    20,810.70/28,719.36 = 11,858.31/x
  3. Step 3: Cross multiply
    20,810.70x = 28,719.36 × 11,858.31
  4. Step 4: Simplify right side
    20,810.70x = 340,563,073.88
  5. Step 5: Solve for x
    x = 340,563,073.88/20,810.70
  6. Step 6: Final answer
    x = 16,364.81

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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.