Home / 20,720.37-31,089.75-10,857.31

Finding the Fourth Proportional to 20,720.37, 31,089.75 and 10,857.31

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Solution

The fourth proportional to 20,720.37, 31,089.75 and 10,857.31 is: 16,290.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.37 : 31,089.75 = 10,857.31 : x
  2. Step 2: Convert to fraction form
    20,720.37/31,089.75 = 10,857.31/x
  3. Step 3: Cross multiply
    20,720.37x = 31,089.75 × 10,857.31
  4. Step 4: Simplify right side
    20,720.37x = 337,550,935.13
  5. Step 5: Solve for x
    x = 337,550,935.13/20,720.37
  6. Step 6: Final answer
    x = 16,290.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.