Home / 21,415.92-29,556.72-11,985

Finding the Fourth Proportional to 21,415.92, 29,556.72 and 11,985

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Solution

The fourth proportional to 21,415.92, 29,556.72 and 11,985 is: 16,540.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,415.92 : 29,556.72 = 11,985 : x
  2. Step 2: Convert to fraction form
    21,415.92/29,556.72 = 11,985/x
  3. Step 3: Cross multiply
    21,415.92x = 29,556.72 × 11,985
  4. Step 4: Simplify right side
    21,415.92x = 354,237,289.20
  5. Step 5: Solve for x
    x = 354,237,289.20/21,415.92
  6. Step 6: Final answer
    x = 16,540.84

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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.