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Finding the Fourth Proportional to 20,572.59, 30,858.99 and 4,990.22

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Solution

The fourth proportional to 20,572.59, 30,858.99 and 4,990.22 is: 7,485.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.59 : 30,858.99 = 4,990.22 : x
  2. Step 2: Convert to fraction form
    20,572.59/30,858.99 = 4,990.22/x
  3. Step 3: Cross multiply
    20,572.59x = 30,858.99 × 4,990.22
  4. Step 4: Simplify right side
    20,572.59x = 153,993,149.08
  5. Step 5: Solve for x
    x = 153,993,149.08/20,572.59
  6. Step 6: Final answer
    x = 7,485.36

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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.