Home / 21,135.81-29,165.37-12,636.24

Finding the Fourth Proportional to 21,135.81, 29,165.37 and 12,636.24

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Solution

The fourth proportional to 21,135.81, 29,165.37 and 12,636.24 is: 17,436.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.81 : 29,165.37 = 12,636.24 : x
  2. Step 2: Convert to fraction form
    21,135.81/29,165.37 = 12,636.24/x
  3. Step 3: Cross multiply
    21,135.81x = 29,165.37 × 12,636.24
  4. Step 4: Simplify right side
    21,135.81x = 368,540,615.01
  5. Step 5: Solve for x
    x = 368,540,615.01/21,135.81
  6. Step 6: Final answer
    x = 17,436.79

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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.