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Finding the Fourth Proportional to 21,695.50, 29,939.79 and 11,759.50

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Solution

The fourth proportional to 21,695.50, 29,939.79 and 11,759.50 is: 16,228.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,695.50 : 29,939.79 = 11,759.50 : x
  2. Step 2: Convert to fraction form
    21,695.50/29,939.79 = 11,759.50/x
  3. Step 3: Cross multiply
    21,695.50x = 29,939.79 × 11,759.50
  4. Step 4: Simplify right side
    21,695.50x = 352,076,960.51
  5. Step 5: Solve for x
    x = 352,076,960.51/21,695.50
  6. Step 6: Final answer
    x = 16,228.11

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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.