Home / 21,390.70-29,519.36-11,959.28

Finding the Fourth Proportional to 21,390.70, 29,519.36 and 11,959.28

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Solution

The fourth proportional to 21,390.70, 29,519.36 and 11,959.28 is: 16,503.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.70 : 29,519.36 = 11,959.28 : x
  2. Step 2: Convert to fraction form
    21,390.70/29,519.36 = 11,959.28/x
  3. Step 3: Cross multiply
    21,390.70x = 29,519.36 × 11,959.28
  4. Step 4: Simplify right side
    21,390.70x = 353,030,291.66
  5. Step 5: Solve for x
    x = 353,030,291.66/21,390.70
  6. Step 6: Final answer
    x = 16,503.91

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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.