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Finding the Fourth Proportional to 6,455.70, 8,905.57 and 4,218.88

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Solution

The fourth proportional to 6,455.70, 8,905.57 and 4,218.88 is: 5,819.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,455.70 : 8,905.57 = 4,218.88 : x
  2. Step 2: Convert to fraction form
    6,455.70/8,905.57 = 4,218.88/x
  3. Step 3: Cross multiply
    6,455.70x = 8,905.57 × 4,218.88
  4. Step 4: Simplify right side
    6,455.70x = 37,571,510.07
  5. Step 5: Solve for x
    x = 37,571,510.07/6,455.70
  6. Step 6: Final answer
    x = 5,819.90

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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.