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Finding the Fourth Proportional to 20,424.40, 30,636.72 and 7,277.28

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Solution

The fourth proportional to 20,424.40, 30,636.72 and 7,277.28 is: 10,915.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,424.40 : 30,636.72 = 7,277.28 : x
  2. Step 2: Convert to fraction form
    20,424.40/30,636.72 = 7,277.28/x
  3. Step 3: Cross multiply
    20,424.40x = 30,636.72 × 7,277.28
  4. Step 4: Simplify right side
    20,424.40x = 222,951,989.72
  5. Step 5: Solve for x
    x = 222,951,989.72/20,424.40
  6. Step 6: Final answer
    x = 10,915.96

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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.