Home / 21,729.16-29,986.70-13,231.64

Finding the Fourth Proportional to 21,729.16, 29,986.70 and 13,231.64

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Solution

The fourth proportional to 21,729.16, 29,986.70 and 13,231.64 is: 18,259.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.16 : 29,986.70 = 13,231.64 : x
  2. Step 2: Convert to fraction form
    21,729.16/29,986.70 = 13,231.64/x
  3. Step 3: Cross multiply
    21,729.16x = 29,986.70 × 13,231.64
  4. Step 4: Simplify right side
    21,729.16x = 396,773,153.03
  5. Step 5: Solve for x
    x = 396,773,153.03/21,729.16
  6. Step 6: Final answer
    x = 18,259.94

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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.