Home / 21,218.78-29,301.62-13,682.75

Finding the Fourth Proportional to 21,218.78, 29,301.62 and 13,682.75

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Solution

The fourth proportional to 21,218.78, 29,301.62 and 13,682.75 is: 18,894.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.78 : 29,301.62 = 13,682.75 : x
  2. Step 2: Convert to fraction form
    21,218.78/29,301.62 = 13,682.75/x
  3. Step 3: Cross multiply
    21,218.78x = 29,301.62 × 13,682.75
  4. Step 4: Simplify right side
    21,218.78x = 400,926,526.13
  5. Step 5: Solve for x
    x = 400,926,526.13/21,218.78
  6. Step 6: Final answer
    x = 18,894.89

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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.