Home / 21,431.81-29,578.43-11,998.55

Finding the Fourth Proportional to 21,431.81, 29,578.43 and 11,998.55

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Solution

The fourth proportional to 21,431.81, 29,578.43 and 11,998.55 is: 16,559.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,431.81 : 29,578.43 = 11,998.55 : x
  2. Step 2: Convert to fraction form
    21,431.81/29,578.43 = 11,998.55/x
  3. Step 3: Cross multiply
    21,431.81x = 29,578.43 × 11,998.55
  4. Step 4: Simplify right side
    21,431.81x = 354,898,271.28
  5. Step 5: Solve for x
    x = 354,898,271.28/21,431.81
  6. Step 6: Final answer
    x = 16,559.42

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Half scale
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Double scale
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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.