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Finding the Fourth Proportional to 20,422.52, 30,630 and 7,275.32

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Solution

The fourth proportional to 20,422.52, 30,630 and 7,275.32 is: 10,911.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.52 : 30,630 = 7,275.32 : x
  2. Step 2: Convert to fraction form
    20,422.52/30,630 = 7,275.32/x
  3. Step 3: Cross multiply
    20,422.52x = 30,630 × 7,275.32
  4. Step 4: Simplify right side
    20,422.52x = 222,843,051.60
  5. Step 5: Solve for x
    x = 222,843,051.60/20,422.52
  6. Step 6: Final answer
    x = 10,911.63

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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.