Home / 21,221.79-29,305.76-13,685.75

Finding the Fourth Proportional to 21,221.79, 29,305.76 and 13,685.75

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Solution

The fourth proportional to 21,221.79, 29,305.76 and 13,685.75 is: 18,899.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,221.79 : 29,305.76 = 13,685.75 : x
  2. Step 2: Convert to fraction form
    21,221.79/29,305.76 = 13,685.75/x
  3. Step 3: Cross multiply
    21,221.79x = 29,305.76 × 13,685.75
  4. Step 4: Simplify right side
    21,221.79x = 401,071,089.96
  5. Step 5: Solve for x
    x = 401,071,089.96/21,221.79
  6. Step 6: Final answer
    x = 18,899.02

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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.