Home / 21,139.13-29,144.34-18,186.68

Finding the Fourth Proportional to 21,139.13, 29,144.34 and 18,186.68

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Solution

The fourth proportional to 21,139.13, 29,144.34 and 18,186.68 is: 25,073.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.13 : 29,144.34 = 18,186.68 : x
  2. Step 2: Convert to fraction form
    21,139.13/29,144.34 = 18,186.68/x
  3. Step 3: Cross multiply
    21,139.13x = 29,144.34 × 18,186.68
  4. Step 4: Simplify right side
    21,139.13x = 530,038,785.39
  5. Step 5: Solve for x
    x = 530,038,785.39/21,139.13
  6. Step 6: Final answer
    x = 25,073.82

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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.