Home / 20,810.28-31,217.40-7,662.90

Finding the Fourth Proportional to 20,810.28, 31,217.40 and 7,662.90

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Solution

The fourth proportional to 20,810.28, 31,217.40 and 7,662.90 is: 11,495.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.28 : 31,217.40 = 7,662.90 : x
  2. Step 2: Convert to fraction form
    20,810.28/31,217.40 = 7,662.90/x
  3. Step 3: Cross multiply
    20,810.28x = 31,217.40 × 7,662.90
  4. Step 4: Simplify right side
    20,810.28x = 239,215,814.46
  5. Step 5: Solve for x
    x = 239,215,814.46/20,810.28
  6. Step 6: Final answer
    x = 11,495.08

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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.