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Finding the Fourth Proportional to 30,405.84, 41,938.94 and 20,846.59

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Solution

The fourth proportional to 30,405.84, 41,938.94 and 20,846.59 is: 28,753.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,405.84 : 41,938.94 = 20,846.59 : x
  2. Step 2: Convert to fraction form
    30,405.84/41,938.94 = 20,846.59/x
  3. Step 3: Cross multiply
    30,405.84x = 41,938.94 × 20,846.59
  4. Step 4: Simplify right side
    30,405.84x = 874,283,887.21
  5. Step 5: Solve for x
    x = 874,283,887.21/30,405.84
  6. Step 6: Final answer
    x = 28,753.81

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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.