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Finding the Fourth Proportional to 21,605.92, 29,869.68 and 21,409.12

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Solution

The fourth proportional to 21,605.92, 29,869.68 and 21,409.12 is: 29,597.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.92 : 29,869.68 = 21,409.12 : x
  2. Step 2: Convert to fraction form
    21,605.92/29,869.68 = 21,409.12/x
  3. Step 3: Cross multiply
    21,605.92x = 29,869.68 × 21,409.12
  4. Step 4: Simplify right side
    21,605.92x = 639,483,563.48
  5. Step 5: Solve for x
    x = 639,483,563.48/21,605.92
  6. Step 6: Final answer
    x = 29,597.61

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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.