Home / 21,818.97-30,091.91-13,420.89

Finding the Fourth Proportional to 21,818.97, 30,091.91 and 13,420.89

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Solution

The fourth proportional to 21,818.97, 30,091.91 and 13,420.89 is: 18,509.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.97 : 30,091.91 = 13,420.89 : x
  2. Step 2: Convert to fraction form
    21,818.97/30,091.91 = 13,420.89/x
  3. Step 3: Cross multiply
    21,818.97x = 30,091.91 × 13,420.89
  4. Step 4: Simplify right side
    21,818.97x = 403,860,146.90
  5. Step 5: Solve for x
    x = 403,860,146.90/21,818.97
  6. Step 6: Final answer
    x = 18,509.59

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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.