Home / 20,355.09-28,106.76-12,813.58

Finding the Fourth Proportional to 20,355.09, 28,106.76 and 12,813.58

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Solution

The fourth proportional to 20,355.09, 28,106.76 and 12,813.58 is: 17,693.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.09 : 28,106.76 = 12,813.58 : x
  2. Step 2: Convert to fraction form
    20,355.09/28,106.76 = 12,813.58/x
  3. Step 3: Cross multiply
    20,355.09x = 28,106.76 × 12,813.58
  4. Step 4: Simplify right side
    20,355.09x = 360,148,217.80
  5. Step 5: Solve for x
    x = 360,148,217.80/20,355.09
  6. Step 6: Final answer
    x = 17,693.28

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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.