Home / 20,910.84-28,870.47-12,961.50

Finding the Fourth Proportional to 20,910.84, 28,870.47 and 12,961.50

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Solution

The fourth proportional to 20,910.84, 28,870.47 and 12,961.50 is: 17,895.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.84 : 28,870.47 = 12,961.50 : x
  2. Step 2: Convert to fraction form
    20,910.84/28,870.47 = 12,961.50/x
  3. Step 3: Cross multiply
    20,910.84x = 28,870.47 × 12,961.50
  4. Step 4: Simplify right side
    20,910.84x = 374,204,596.91
  5. Step 5: Solve for x
    x = 374,204,596.91/20,910.84
  6. Step 6: Final answer
    x = 17,895.24

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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.