Home / 21,116.40-31,645.44-20,485.68

Finding the Fourth Proportional to 21,116.40, 31,645.44 and 20,485.68

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Solution

The fourth proportional to 21,116.40, 31,645.44 and 20,485.68 is: 30,700.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,116.40 : 31,645.44 = 20,485.68 : x
  2. Step 2: Convert to fraction form
    21,116.40/31,645.44 = 20,485.68/x
  3. Step 3: Cross multiply
    21,116.40x = 31,645.44 × 20,485.68
  4. Step 4: Simplify right side
    21,116.40x = 648,278,357.30
  5. Step 5: Solve for x
    x = 648,278,357.30/21,116.40
  6. Step 6: Final answer
    x = 30,700.23

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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.