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Finding the Fourth Proportional to 27,658.72, 38,168.69 and 15,721.28

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Solution

The fourth proportional to 27,658.72, 38,168.69 and 15,721.28 is: 21,695.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,658.72 : 38,168.69 = 15,721.28 : x
  2. Step 2: Convert to fraction form
    27,658.72/38,168.69 = 15,721.28/x
  3. Step 3: Cross multiply
    27,658.72x = 38,168.69 × 15,721.28
  4. Step 4: Simplify right side
    27,658.72x = 600,060,536.41
  5. Step 5: Solve for x
    x = 600,060,536.41/27,658.72
  6. Step 6: Final answer
    x = 21,695.17

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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.