Home / 15,421.90-21,324.17-15,171.81

Finding the Fourth Proportional to 15,421.90, 21,324.17 and 15,171.81

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Solution

The fourth proportional to 15,421.90, 21,324.17 and 15,171.81 is: 20,978.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,421.90 : 21,324.17 = 15,171.81 : x
  2. Step 2: Convert to fraction form
    15,421.90/21,324.17 = 15,171.81/x
  3. Step 3: Cross multiply
    15,421.90x = 21,324.17 × 15,171.81
  4. Step 4: Simplify right side
    15,421.90x = 323,526,293.58
  5. Step 5: Solve for x
    x = 323,526,293.58/15,421.90
  6. Step 6: Final answer
    x = 20,978.37

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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.