Home / 21,841.25-30,156.60-15,115.21

Finding the Fourth Proportional to 21,841.25, 30,156.60 and 15,115.21

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Solution

The fourth proportional to 21,841.25, 30,156.60 and 15,115.21 is: 20,869.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,841.25 : 30,156.60 = 15,115.21 : x
  2. Step 2: Convert to fraction form
    21,841.25/30,156.60 = 15,115.21/x
  3. Step 3: Cross multiply
    21,841.25x = 30,156.60 × 15,115.21
  4. Step 4: Simplify right side
    21,841.25x = 455,823,323.18
  5. Step 5: Solve for x
    x = 455,823,323.18/21,841.25
  6. Step 6: Final answer
    x = 20,869.84

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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.