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Finding the Fourth Proportional to 21,056.39, 29,057.39 and 12,103.66

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Solution

The fourth proportional to 21,056.39, 29,057.39 and 12,103.66 is: 16,702.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,056.39 : 29,057.39 = 12,103.66 : x
  2. Step 2: Convert to fraction form
    21,056.39/29,057.39 = 12,103.66/x
  3. Step 3: Cross multiply
    21,056.39x = 29,057.39 × 12,103.66
  4. Step 4: Simplify right side
    21,056.39x = 351,700,744.85
  5. Step 5: Solve for x
    x = 351,700,744.85/21,056.39
  6. Step 6: Final answer
    x = 16,702.80

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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.