Home / 21,010.20-31,515.30-18,706.20

Finding the Fourth Proportional to 21,010.20, 31,515.30 and 18,706.20

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Solution

The fourth proportional to 21,010.20, 31,515.30 and 18,706.20 is: 28,059.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.20 : 31,515.30 = 18,706.20 : x
  2. Step 2: Convert to fraction form
    21,010.20/31,515.30 = 18,706.20/x
  3. Step 3: Cross multiply
    21,010.20x = 31,515.30 × 18,706.20
  4. Step 4: Simplify right side
    21,010.20x = 589,531,504.86
  5. Step 5: Solve for x
    x = 589,531,504.86/21,010.20
  6. Step 6: Final answer
    x = 28,059.30

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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.