Home / 15,378.33-21,221.49-8,665.30

Finding the Fourth Proportional to 15,378.33, 21,221.49 and 8,665.30

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Solution

The fourth proportional to 15,378.33, 21,221.49 and 8,665.30 is: 11,957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,378.33 : 21,221.49 = 8,665.30 : x
  2. Step 2: Convert to fraction form
    15,378.33/21,221.49 = 8,665.30/x
  3. Step 3: Cross multiply
    15,378.33x = 21,221.49 × 8,665.30
  4. Step 4: Simplify right side
    15,378.33x = 183,890,696.00
  5. Step 5: Solve for x
    x = 183,890,696.00/15,378.33
  6. Step 6: Final answer
    x = 11,957.78

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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.