Home / 28,380.76-39,165.06-15,805.60

Finding the Fourth Proportional to 28,380.76, 39,165.06 and 15,805.60

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Solution

The fourth proportional to 28,380.76, 39,165.06 and 15,805.60 is: 21,811.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,380.76 : 39,165.06 = 15,805.60 : x
  2. Step 2: Convert to fraction form
    28,380.76/39,165.06 = 15,805.60/x
  3. Step 3: Cross multiply
    28,380.76x = 39,165.06 × 15,805.60
  4. Step 4: Simplify right side
    28,380.76x = 619,027,272.34
  5. Step 5: Solve for x
    x = 619,027,272.34/28,380.76
  6. Step 6: Final answer
    x = 21,811.51

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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.