Home / 20,971.24-31,457.10-7,121.32

Finding the Fourth Proportional to 20,971.24, 31,457.10 and 7,121.32

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Solution

The fourth proportional to 20,971.24, 31,457.10 and 7,121.32 is: 10,682.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.24 : 31,457.10 = 7,121.32 : x
  2. Step 2: Convert to fraction form
    20,971.24/31,457.10 = 7,121.32/x
  3. Step 3: Cross multiply
    20,971.24x = 31,457.10 × 7,121.32
  4. Step 4: Simplify right side
    20,971.24x = 224,016,075.37
  5. Step 5: Solve for x
    x = 224,016,075.37/20,971.24
  6. Step 6: Final answer
    x = 10,682.06

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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.