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Finding the Fourth Proportional to 21,911.16, 30,241.20 and 21,182.16

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Solution

The fourth proportional to 21,911.16, 30,241.20 and 21,182.16 is: 29,235.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.16 : 30,241.20 = 21,182.16 : x
  2. Step 2: Convert to fraction form
    21,911.16/30,241.20 = 21,182.16/x
  3. Step 3: Cross multiply
    21,911.16x = 30,241.20 × 21,182.16
  4. Step 4: Simplify right side
    21,911.16x = 640,573,936.99
  5. Step 5: Solve for x
    x = 640,573,936.99/21,911.16
  6. Step 6: Final answer
    x = 29,235.05

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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.