Home / 21,138.54-29,171.80-11,707.10

Finding the Fourth Proportional to 21,138.54, 29,171.80 and 11,707.10

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Solution

The fourth proportional to 21,138.54, 29,171.80 and 11,707.10 is: 16,156.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.54 : 29,171.80 = 11,707.10 : x
  2. Step 2: Convert to fraction form
    21,138.54/29,171.80 = 11,707.10/x
  3. Step 3: Cross multiply
    21,138.54x = 29,171.80 × 11,707.10
  4. Step 4: Simplify right side
    21,138.54x = 341,517,179.78
  5. Step 5: Solve for x
    x = 341,517,179.78/21,138.54
  6. Step 6: Final answer
    x = 16,156.14

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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.