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Finding the Fourth Proportional to 20,603.64, 30,905.46 and 7,455.72

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Solution

The fourth proportional to 20,603.64, 30,905.46 and 7,455.72 is: 11,183.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.64 : 30,905.46 = 7,455.72 : x
  2. Step 2: Convert to fraction form
    20,603.64/30,905.46 = 7,455.72/x
  3. Step 3: Cross multiply
    20,603.64x = 30,905.46 × 7,455.72
  4. Step 4: Simplify right side
    20,603.64x = 230,422,456.23
  5. Step 5: Solve for x
    x = 230,422,456.23/20,603.64
  6. Step 6: Final answer
    x = 11,183.58

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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.