Home / 28,220.76-38,940.48-15,645.60

Finding the Fourth Proportional to 28,220.76, 38,940.48 and 15,645.60

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Solution

The fourth proportional to 28,220.76, 38,940.48 and 15,645.60 is: 21,588.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,220.76 : 38,940.48 = 15,645.60 : x
  2. Step 2: Convert to fraction form
    28,220.76/38,940.48 = 15,645.60/x
  3. Step 3: Cross multiply
    28,220.76x = 38,940.48 × 15,645.60
  4. Step 4: Simplify right side
    28,220.76x = 609,247,173.89
  5. Step 5: Solve for x
    x = 609,247,173.89/28,220.76
  6. Step 6: Final answer
    x = 21,588.62

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Half scale
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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.