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Finding the Fourth Proportional to 21,710.92, 29,960.58 and 12,279.64

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Solution

The fourth proportional to 21,710.92, 29,960.58 and 12,279.64 is: 16,945.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,710.92 : 29,960.58 = 12,279.64 : x
  2. Step 2: Convert to fraction form
    21,710.92/29,960.58 = 12,279.64/x
  3. Step 3: Cross multiply
    21,710.92x = 29,960.58 × 12,279.64
  4. Step 4: Simplify right side
    21,710.92x = 367,905,136.59
  5. Step 5: Solve for x
    x = 367,905,136.59/21,710.92
  6. Step 6: Final answer
    x = 16,945.63

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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.