Home / 21,111.90-29,138.43-15,078.48

Finding the Fourth Proportional to 21,111.90, 29,138.43 and 15,078.48

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Solution

The fourth proportional to 21,111.90, 29,138.43 and 15,078.48 is: 20,811.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.90 : 29,138.43 = 15,078.48 : x
  2. Step 2: Convert to fraction form
    21,111.90/29,138.43 = 15,078.48/x
  3. Step 3: Cross multiply
    21,111.90x = 29,138.43 × 15,078.48
  4. Step 4: Simplify right side
    21,111.90x = 439,363,233.99
  5. Step 5: Solve for x
    x = 439,363,233.99/21,111.90
  6. Step 6: Final answer
    x = 20,811.16

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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.