Home / 21,208.10-31,812.15-20,114.60

Finding the Fourth Proportional to 21,208.10, 31,812.15 and 20,114.60

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Solution

The fourth proportional to 21,208.10, 31,812.15 and 20,114.60 is: 30,171.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.10 : 31,812.15 = 20,114.60 : x
  2. Step 2: Convert to fraction form
    21,208.10/31,812.15 = 20,114.60/x
  3. Step 3: Cross multiply
    21,208.10x = 31,812.15 × 20,114.60
  4. Step 4: Simplify right side
    21,208.10x = 639,888,672.39
  5. Step 5: Solve for x
    x = 639,888,672.39/21,208.10
  6. Step 6: Final answer
    x = 30,171.90

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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.