Home / 21,423.40-29,561.62-11,989.64

Finding the Fourth Proportional to 21,423.40, 29,561.62 and 11,989.64

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Solution

The fourth proportional to 21,423.40, 29,561.62 and 11,989.64 is: 16,544.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,423.40 : 29,561.62 = 11,989.64 : x
  2. Step 2: Convert to fraction form
    21,423.40/29,561.62 = 11,989.64/x
  3. Step 3: Cross multiply
    21,423.40x = 29,561.62 × 11,989.64
  4. Step 4: Simplify right side
    21,423.40x = 354,433,181.62
  5. Step 5: Solve for x
    x = 354,433,181.62/21,423.40
  6. Step 6: Final answer
    x = 16,544.21

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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.