Home / 20,805.54-28,712.78-12,312.69

Finding the Fourth Proportional to 20,805.54, 28,712.78 and 12,312.69

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Solution

The fourth proportional to 20,805.54, 28,712.78 and 12,312.69 is: 16,992.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.54 : 28,712.78 = 12,312.69 : x
  2. Step 2: Convert to fraction form
    20,805.54/28,712.78 = 12,312.69/x
  3. Step 3: Cross multiply
    20,805.54x = 28,712.78 × 12,312.69
  4. Step 4: Simplify right side
    20,805.54x = 353,531,559.18
  5. Step 5: Solve for x
    x = 353,531,559.18/20,805.54
  6. Step 6: Final answer
    x = 16,992.18

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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.