Home / 21,621.49-29,833.11-13,128.08

Finding the Fourth Proportional to 21,621.49, 29,833.11 and 13,128.08

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Solution

The fourth proportional to 21,621.49, 29,833.11 and 13,128.08 is: 18,113.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,621.49 : 29,833.11 = 13,128.08 : x
  2. Step 2: Convert to fraction form
    21,621.49/29,833.11 = 13,128.08/x
  3. Step 3: Cross multiply
    21,621.49x = 29,833.11 × 13,128.08
  4. Step 4: Simplify right side
    21,621.49x = 391,651,454.73
  5. Step 5: Solve for x
    x = 391,651,454.73/21,621.49
  6. Step 6: Final answer
    x = 18,113.99

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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.