Home / 21,018.49-31,540.79-7,880.09

Finding the Fourth Proportional to 21,018.49, 31,540.79 and 7,880.09

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Solution

The fourth proportional to 21,018.49, 31,540.79 and 7,880.09 is: 11,825.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.49 : 31,540.79 = 7,880.09 : x
  2. Step 2: Convert to fraction form
    21,018.49/31,540.79 = 7,880.09/x
  3. Step 3: Cross multiply
    21,018.49x = 31,540.79 × 7,880.09
  4. Step 4: Simplify right side
    21,018.49x = 248,544,125.87
  5. Step 5: Solve for x
    x = 248,544,125.87/21,018.49
  6. Step 6: Final answer
    x = 11,825.02

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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.