Home / 20,918.31-28,855.22-12,529.95

Finding the Fourth Proportional to 20,918.31, 28,855.22 and 12,529.95

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Solution

The fourth proportional to 20,918.31, 28,855.22 and 12,529.95 is: 17,284.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.31 : 28,855.22 = 12,529.95 : x
  2. Step 2: Convert to fraction form
    20,918.31/28,855.22 = 12,529.95/x
  3. Step 3: Cross multiply
    20,918.31x = 28,855.22 × 12,529.95
  4. Step 4: Simplify right side
    20,918.31x = 361,554,401.19
  5. Step 5: Solve for x
    x = 361,554,401.19/20,918.31
  6. Step 6: Final answer
    x = 17,284.11

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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.