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Finding the Fourth Proportional to 21,471.39, 29,630.75 and 12,039.75

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Solution

The fourth proportional to 21,471.39, 29,630.75 and 12,039.75 is: 16,614.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,471.39 : 29,630.75 = 12,039.75 : x
  2. Step 2: Convert to fraction form
    21,471.39/29,630.75 = 12,039.75/x
  3. Step 3: Cross multiply
    21,471.39x = 29,630.75 × 12,039.75
  4. Step 4: Simplify right side
    21,471.39x = 356,746,762.11
  5. Step 5: Solve for x
    x = 356,746,762.11/21,471.39
  6. Step 6: Final answer
    x = 16,614.98

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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.