Home / 15,455.78-21,328.92-8,382.20

Finding the Fourth Proportional to 15,455.78, 21,328.92 and 8,382.20

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Solution

The fourth proportional to 15,455.78, 21,328.92 and 8,382.20 is: 11,567.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,455.78 : 21,328.92 = 8,382.20 : x
  2. Step 2: Convert to fraction form
    15,455.78/21,328.92 = 8,382.20/x
  3. Step 3: Cross multiply
    15,455.78x = 21,328.92 × 8,382.20
  4. Step 4: Simplify right side
    15,455.78x = 178,783,273.22
  5. Step 5: Solve for x
    x = 178,783,273.22/15,455.78
  6. Step 6: Final answer
    x = 11,567.41

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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.