Home / 21,130.88-29,160.81-11,699.64

Finding the Fourth Proportional to 21,130.88, 29,160.81 and 11,699.64

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Solution

The fourth proportional to 21,130.88, 29,160.81 and 11,699.64 is: 16,145.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,130.88 : 29,160.81 = 11,699.64 : x
  2. Step 2: Convert to fraction form
    21,130.88/29,160.81 = 11,699.64/x
  3. Step 3: Cross multiply
    21,130.88x = 29,160.81 × 11,699.64
  4. Step 4: Simplify right side
    21,130.88x = 341,170,979.11
  5. Step 5: Solve for x
    x = 341,170,979.11/21,130.88
  6. Step 6: Final answer
    x = 16,145.62

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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.