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Finding the Fourth Proportional to 15,721.78, 21,696.06 and 8,648.68

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Solution

The fourth proportional to 15,721.78, 21,696.06 and 8,648.68 is: 11,935.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.78 : 21,696.06 = 8,648.68 : x
  2. Step 2: Convert to fraction form
    15,721.78/21,696.06 = 8,648.68/x
  3. Step 3: Cross multiply
    15,721.78x = 21,696.06 × 8,648.68
  4. Step 4: Simplify right side
    15,721.78x = 187,642,280.20
  5. Step 5: Solve for x
    x = 187,642,280.20/15,721.78
  6. Step 6: Final answer
    x = 11,935.18

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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.