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Finding the Fourth Proportional to 1,478.97, 2,218.46 and 657.09

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Solution

The fourth proportional to 1,478.97, 2,218.46 and 657.09 is: 985.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.97 : 2,218.46 = 657.09 : x
  2. Step 2: Convert to fraction form
    1,478.97/2,218.46 = 657.09/x
  3. Step 3: Cross multiply
    1,478.97x = 2,218.46 × 657.09
  4. Step 4: Simplify right side
    1,478.97x = 1,457,724.60
  5. Step 5: Solve for x
    x = 1,457,724.60/1,478.97
  6. Step 6: Final answer
    x = 985.64

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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.