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Finding the Fourth Proportional to 15,726.91, 21,703.13 and 8,653.79

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Solution

The fourth proportional to 15,726.91, 21,703.13 and 8,653.79 is: 11,942.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,726.91 : 21,703.13 = 8,653.79 : x
  2. Step 2: Convert to fraction form
    15,726.91/21,703.13 = 8,653.79/x
  3. Step 3: Cross multiply
    15,726.91x = 21,703.13 × 8,653.79
  4. Step 4: Simplify right side
    15,726.91x = 187,814,220.85
  5. Step 5: Solve for x
    x = 187,814,220.85/15,726.91
  6. Step 6: Final answer
    x = 11,942.22

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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.