Home / 21,918.19-30,239.71-12,480.07

Finding the Fourth Proportional to 21,918.19, 30,239.71 and 12,480.07

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Solution

The fourth proportional to 21,918.19, 30,239.71 and 12,480.07 is: 17,218.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.19 : 30,239.71 = 12,480.07 : x
  2. Step 2: Convert to fraction form
    21,918.19/30,239.71 = 12,480.07/x
  3. Step 3: Cross multiply
    21,918.19x = 30,239.71 × 12,480.07
  4. Step 4: Simplify right side
    21,918.19x = 377,393,697.58
  5. Step 5: Solve for x
    x = 377,393,697.58/21,918.19
  6. Step 6: Final answer
    x = 17,218.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.