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Finding the Fourth Proportional to 20,605.80, 30,911.12 and 6,560.91

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Solution

The fourth proportional to 20,605.80, 30,911.12 and 6,560.91 is: 9,842.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605.80 : 30,911.12 = 6,560.91 : x
  2. Step 2: Convert to fraction form
    20,605.80/30,911.12 = 6,560.91/x
  3. Step 3: Cross multiply
    20,605.80x = 30,911.12 × 6,560.91
  4. Step 4: Simplify right side
    20,605.80x = 202,805,076.32
  5. Step 5: Solve for x
    x = 202,805,076.32/20,605.80
  6. Step 6: Final answer
    x = 9,842.14

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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.