Home / 21,918.69-30,240.41-12,480.57

Finding the Fourth Proportional to 21,918.69, 30,240.41 and 12,480.57

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Solution

The fourth proportional to 21,918.69, 30,240.41 and 12,480.57 is: 17,218.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.69 : 30,240.41 = 12,480.57 : x
  2. Step 2: Convert to fraction form
    21,918.69/30,240.41 = 12,480.57/x
  3. Step 3: Cross multiply
    21,918.69x = 30,240.41 × 12,480.57
  4. Step 4: Simplify right side
    21,918.69x = 377,417,491.43
  5. Step 5: Solve for x
    x = 377,417,491.43/21,918.69
  6. Step 6: Final answer
    x = 17,218.98

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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.