Home / 20,909.75-28,860.99-12,947.45

Finding the Fourth Proportional to 20,909.75, 28,860.99 and 12,947.45

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Solution

The fourth proportional to 20,909.75, 28,860.99 and 12,947.45 is: 17,870.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.75 : 28,860.99 = 12,947.45 : x
  2. Step 2: Convert to fraction form
    20,909.75/28,860.99 = 12,947.45/x
  3. Step 3: Cross multiply
    20,909.75x = 28,860.99 × 12,947.45
  4. Step 4: Simplify right side
    20,909.75x = 373,676,160.24
  5. Step 5: Solve for x
    x = 373,676,160.24/20,909.75
  6. Step 6: Final answer
    x = 17,870.91

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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.