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Finding the Fourth Proportional to 21,243.70, 29,313.93 and 11,811.70

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Solution

The fourth proportional to 21,243.70, 29,313.93 and 11,811.70 is: 16,298.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,243.70 : 29,313.93 = 11,811.70 : x
  2. Step 2: Convert to fraction form
    21,243.70/29,313.93 = 11,811.70/x
  3. Step 3: Cross multiply
    21,243.70x = 29,313.93 × 11,811.70
  4. Step 4: Simplify right side
    21,243.70x = 346,247,346.98
  5. Step 5: Solve for x
    x = 346,247,346.98/21,243.70
  6. Step 6: Final answer
    x = 16,298.82

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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.