Home / 21,313.45-31,970.19-11,515.03

Finding the Fourth Proportional to 21,313.45, 31,970.19 and 11,515.03

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Solution

The fourth proportional to 21,313.45, 31,970.19 and 11,515.03 is: 17,272.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,313.45 : 31,970.19 = 11,515.03 : x
  2. Step 2: Convert to fraction form
    21,313.45/31,970.19 = 11,515.03/x
  3. Step 3: Cross multiply
    21,313.45x = 31,970.19 × 11,515.03
  4. Step 4: Simplify right side
    21,313.45x = 368,137,696.96
  5. Step 5: Solve for x
    x = 368,137,696.96/21,313.45
  6. Step 6: Final answer
    x = 17,272.55

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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.