Home / 21,621.81-29,837.70-12,190.38

Finding the Fourth Proportional to 21,621.81, 29,837.70 and 12,190.38

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Solution

The fourth proportional to 21,621.81, 29,837.70 and 12,190.38 is: 16,822.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,621.81 : 29,837.70 = 12,190.38 : x
  2. Step 2: Convert to fraction form
    21,621.81/29,837.70 = 12,190.38/x
  3. Step 3: Cross multiply
    21,621.81x = 29,837.70 × 12,190.38
  4. Step 4: Simplify right side
    21,621.81x = 363,732,901.33
  5. Step 5: Solve for x
    x = 363,732,901.33/21,621.81
  6. Step 6: Final answer
    x = 16,822.50

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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.