Home / 18,720.05-25,812.68-12,755.21

Finding the Fourth Proportional to 18,720.05, 25,812.68 and 12,755.21

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Solution

The fourth proportional to 18,720.05, 25,812.68 and 12,755.21 is: 17,587.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.05 : 25,812.68 = 12,755.21 : x
  2. Step 2: Convert to fraction form
    18,720.05/25,812.68 = 12,755.21/x
  3. Step 3: Cross multiply
    18,720.05x = 25,812.68 × 12,755.21
  4. Step 4: Simplify right side
    18,720.05x = 329,246,154.06
  5. Step 5: Solve for x
    x = 329,246,154.06/18,720.05
  6. Step 6: Final answer
    x = 17,587.89

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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.