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Finding the Fourth Proportional to 6,455.45, 8,905.22 and 4,218.63

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Solution

The fourth proportional to 6,455.45, 8,905.22 and 4,218.63 is: 5,819.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,455.45 : 8,905.22 = 4,218.63 : x
  2. Step 2: Convert to fraction form
    6,455.45/8,905.22 = 4,218.63/x
  3. Step 3: Cross multiply
    6,455.45x = 8,905.22 × 4,218.63
  4. Step 4: Simplify right side
    6,455.45x = 37,567,828.25
  5. Step 5: Solve for x
    x = 37,567,828.25/6,455.45
  6. Step 6: Final answer
    x = 5,819.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.