Home / 21,821.40-30,115.98-12,391.56

Finding the Fourth Proportional to 21,821.40, 30,115.98 and 12,391.56

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Solution

The fourth proportional to 21,821.40, 30,115.98 and 12,391.56 is: 17,101.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.40 : 30,115.98 = 12,391.56 : x
  2. Step 2: Convert to fraction form
    21,821.40/30,115.98 = 12,391.56/x
  3. Step 3: Cross multiply
    21,821.40x = 30,115.98 × 12,391.56
  4. Step 4: Simplify right side
    21,821.40x = 373,183,973.13
  5. Step 5: Solve for x
    x = 373,183,973.13/21,821.40
  6. Step 6: Final answer
    x = 17,101.74

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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.