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Finding the Fourth Proportional to 61,161.80, 91,721.10 and 21,720.20

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Solution

The fourth proportional to 61,161.80, 91,721.10 and 21,720.20 is: 32,572.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,161.80 : 91,721.10 = 21,720.20 : x
  2. Step 2: Convert to fraction form
    61,161.80/91,721.10 = 21,720.20/x
  3. Step 3: Cross multiply
    61,161.80x = 91,721.10 × 21,720.20
  4. Step 4: Simplify right side
    61,161.80x = 1,992,200,636.22
  5. Step 5: Solve for x
    x = 1,992,200,636.22/61,161.80
  6. Step 6: Final answer
    x = 32,572.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.