Home / 21,004.46-31,506.70-5,420.88

Finding the Fourth Proportional to 21,004.46, 31,506.70 and 5,420.88

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Solution

The fourth proportional to 21,004.46, 31,506.70 and 5,420.88 is: 8,131.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,004.46 : 31,506.70 = 5,420.88 : x
  2. Step 2: Convert to fraction form
    21,004.46/31,506.70 = 5,420.88/x
  3. Step 3: Cross multiply
    21,004.46x = 31,506.70 × 5,420.88
  4. Step 4: Simplify right side
    21,004.46x = 170,794,039.90
  5. Step 5: Solve for x
    x = 170,794,039.90/21,004.46
  6. Step 6: Final answer
    x = 8,131.32

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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.