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Finding the Fourth Proportional to 20,643.87, 30,904.23 and 20,291.22

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Solution

The fourth proportional to 20,643.87, 30,904.23 and 20,291.22 is: 30,376.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.87 : 30,904.23 = 20,291.22 : x
  2. Step 2: Convert to fraction form
    20,643.87/30,904.23 = 20,291.22/x
  3. Step 3: Cross multiply
    20,643.87x = 30,904.23 × 20,291.22
  4. Step 4: Simplify right side
    20,643.87x = 627,084,529.86
  5. Step 5: Solve for x
    x = 627,084,529.86/20,643.87
  6. Step 6: Final answer
    x = 30,376.31

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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.