Home / 21,818.89-30,109.89-12,387.25

Finding the Fourth Proportional to 21,818.89, 30,109.89 and 12,387.25

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Solution

The fourth proportional to 21,818.89, 30,109.89 and 12,387.25 is: 17,094.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,818.89 : 30,109.89 = 12,387.25 : x
  2. Step 2: Convert to fraction form
    21,818.89/30,109.89 = 12,387.25/x
  3. Step 3: Cross multiply
    21,818.89x = 30,109.89 × 12,387.25
  4. Step 4: Simplify right side
    21,818.89x = 372,978,734.90
  5. Step 5: Solve for x
    x = 372,978,734.90/21,818.89
  6. Step 6: Final answer
    x = 17,094.30

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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.