Home / 15,721.38-21,696.10-8,647.64

Finding the Fourth Proportional to 15,721.38, 21,696.10 and 8,647.64

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Solution

The fourth proportional to 15,721.38, 21,696.10 and 8,647.64 is: 11,934.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.38 : 21,696.10 = 8,647.64 : x
  2. Step 2: Convert to fraction form
    15,721.38/21,696.10 = 8,647.64/x
  3. Step 3: Cross multiply
    15,721.38x = 21,696.10 × 8,647.64
  4. Step 4: Simplify right side
    15,721.38x = 187,620,062.20
  5. Step 5: Solve for x
    x = 187,620,062.20/15,721.38
  6. Step 6: Final answer
    x = 11,934.07

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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.