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Finding the Fourth Proportional to 20,456.72, 30,685.13 and 6,605.72

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Solution

The fourth proportional to 20,456.72, 30,685.13 and 6,605.72 is: 9,908.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.72 : 30,685.13 = 6,605.72 : x
  2. Step 2: Convert to fraction form
    20,456.72/30,685.13 = 6,605.72/x
  3. Step 3: Cross multiply
    20,456.72x = 30,685.13 × 6,605.72
  4. Step 4: Simplify right side
    20,456.72x = 202,697,330.33
  5. Step 5: Solve for x
    x = 202,697,330.33/20,456.72
  6. Step 6: Final answer
    x = 9,908.59

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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.