Home / 21,388.58-31,918-18,797.12

Finding the Fourth Proportional to 21,388.58, 31,918 and 18,797.12

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Solution

The fourth proportional to 21,388.58, 31,918 and 18,797.12 is: 28,050.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.58 : 31,918 = 18,797.12 : x
  2. Step 2: Convert to fraction form
    21,388.58/31,918 = 18,797.12/x
  3. Step 3: Cross multiply
    21,388.58x = 31,918 × 18,797.12
  4. Step 4: Simplify right side
    21,388.58x = 599,966,476.16
  5. Step 5: Solve for x
    x = 599,966,476.16/21,388.58
  6. Step 6: Final answer
    x = 28,050.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.