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Finding the Fourth Proportional to 21,861.70, 30,664.70 and 21,861.70

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Solution

The fourth proportional to 21,861.70, 30,664.70 and 21,861.70 is: 30,664.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,861.70 : 30,664.70 = 21,861.70 : x
  2. Step 2: Convert to fraction form
    21,861.70/30,664.70 = 21,861.70/x
  3. Step 3: Cross multiply
    21,861.70x = 30,664.70 × 21,861.70
  4. Step 4: Simplify right side
    21,861.70x = 670,382,471.99
  5. Step 5: Solve for x
    x = 670,382,471.99/21,861.70
  6. Step 6: Final answer
    x = 30,664.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.