Home / 28,538.60-39,420.91-21,906.18

Finding the Fourth Proportional to 28,538.60, 39,420.91 and 21,906.18

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Solution

The fourth proportional to 28,538.60, 39,420.91 and 21,906.18 is: 30,259.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,538.60 : 39,420.91 = 21,906.18 : x
  2. Step 2: Convert to fraction form
    28,538.60/39,420.91 = 21,906.18/x
  3. Step 3: Cross multiply
    28,538.60x = 39,420.91 × 21,906.18
  4. Step 4: Simplify right side
    28,538.60x = 863,561,577.61
  5. Step 5: Solve for x
    x = 863,561,577.61/28,538.60
  6. Step 6: Final answer
    x = 30,259.43

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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.