Home / 18,715.05-25,805.79-12,750.21

Finding the Fourth Proportional to 18,715.05, 25,805.79 and 12,750.21

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Solution

The fourth proportional to 18,715.05, 25,805.79 and 12,750.21 is: 17,581.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.05 : 25,805.79 = 12,750.21 : x
  2. Step 2: Convert to fraction form
    18,715.05/25,805.79 = 12,750.21/x
  3. Step 3: Cross multiply
    18,715.05x = 25,805.79 × 12,750.21
  4. Step 4: Simplify right side
    18,715.05x = 329,029,241.72
  5. Step 5: Solve for x
    x = 329,029,241.72/18,715.05
  6. Step 6: Final answer
    x = 17,581.00

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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.