Home / 21,419.20-29,556.72-12,805.19

Finding the Fourth Proportional to 21,419.20, 29,556.72 and 12,805.19

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Solution

The fourth proportional to 21,419.20, 29,556.72 and 12,805.19 is: 17,670.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,419.20 : 29,556.72 = 12,805.19 : x
  2. Step 2: Convert to fraction form
    21,419.20/29,556.72 = 12,805.19/x
  3. Step 3: Cross multiply
    21,419.20x = 29,556.72 × 12,805.19
  4. Step 4: Simplify right side
    21,419.20x = 378,479,267.59
  5. Step 5: Solve for x
    x = 378,479,267.59/21,419.20
  6. Step 6: Final answer
    x = 17,670.10

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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.