Home / 21,128.23-29,130.48-13,561.21

Finding the Fourth Proportional to 21,128.23, 29,130.48 and 13,561.21

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Solution

The fourth proportional to 21,128.23, 29,130.48 and 13,561.21 is: 18,697.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.23 : 29,130.48 = 13,561.21 : x
  2. Step 2: Convert to fraction form
    21,128.23/29,130.48 = 13,561.21/x
  3. Step 3: Cross multiply
    21,128.23x = 29,130.48 × 13,561.21
  4. Step 4: Simplify right side
    21,128.23x = 395,044,556.68
  5. Step 5: Solve for x
    x = 395,044,556.68/21,128.23
  6. Step 6: Final answer
    x = 18,697.48

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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.