Home / 15,142.47-20,896.82-8,428.38

Finding the Fourth Proportional to 15,142.47, 20,896.82 and 8,428.38

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Solution

The fourth proportional to 15,142.47, 20,896.82 and 8,428.38 is: 11,631.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,142.47 : 20,896.82 = 8,428.38 : x
  2. Step 2: Convert to fraction form
    15,142.47/20,896.82 = 8,428.38/x
  3. Step 3: Cross multiply
    15,142.47x = 20,896.82 × 8,428.38
  4. Step 4: Simplify right side
    15,142.47x = 176,126,339.75
  5. Step 5: Solve for x
    x = 176,126,339.75/15,142.47
  6. Step 6: Final answer
    x = 11,631.28

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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.