Home / 20,645.78-30,810.45-18,431.42

Finding the Fourth Proportional to 20,645.78, 30,810.45 and 18,431.42

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Solution

The fourth proportional to 20,645.78, 30,810.45 and 18,431.42 is: 27,505.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.78 : 30,810.45 = 18,431.42 : x
  2. Step 2: Convert to fraction form
    20,645.78/30,810.45 = 18,431.42/x
  3. Step 3: Cross multiply
    20,645.78x = 30,810.45 × 18,431.42
  4. Step 4: Simplify right side
    20,645.78x = 567,880,252.18
  5. Step 5: Solve for x
    x = 567,880,252.18/20,645.78
  6. Step 6: Final answer
    x = 27,505.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.