Home / 21,021.80-29,012.11-15,707.39

Finding the Fourth Proportional to 21,021.80, 29,012.11 and 15,707.39

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Solution

The fourth proportional to 21,021.80, 29,012.11 and 15,707.39 is: 21,677.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.80 : 29,012.11 = 15,707.39 : x
  2. Step 2: Convert to fraction form
    21,021.80/29,012.11 = 15,707.39/x
  3. Step 3: Cross multiply
    21,021.80x = 29,012.11 × 15,707.39
  4. Step 4: Simplify right side
    21,021.80x = 455,704,342.16
  5. Step 5: Solve for x
    x = 455,704,342.16/21,021.80
  6. Step 6: Final answer
    x = 21,677.71

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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.