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Finding the Fourth Proportional to 3,218.70, 4,828.05 and 910.20

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Solution

The fourth proportional to 3,218.70, 4,828.05 and 910.20 is: 1,365.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,218.70 : 4,828.05 = 910.20 : x
  2. Step 2: Convert to fraction form
    3,218.70/4,828.05 = 910.20/x
  3. Step 3: Cross multiply
    3,218.70x = 4,828.05 × 910.20
  4. Step 4: Simplify right side
    3,218.70x = 4,394,491.11
  5. Step 5: Solve for x
    x = 4,394,491.11/3,218.70
  6. Step 6: Final answer
    x = 1,365.30

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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.