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Finding the Fourth Proportional to 674.40, 931.20 and 453.60

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Solution

The fourth proportional to 674.40, 931.20 and 453.60 is: 626.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.40 : 931.20 = 453.60 : x
  2. Step 2: Convert to fraction form
    674.40/931.20 = 453.60/x
  3. Step 3: Cross multiply
    674.40x = 931.20 × 453.60
  4. Step 4: Simplify right side
    674.40x = 422,392.32
  5. Step 5: Solve for x
    x = 422,392.32/674.40
  6. Step 6: Final answer
    x = 626.32

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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.