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Finding the Fourth Proportional to 642.28, 885.60 and 450.16

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Solution

The fourth proportional to 642.28, 885.60 and 450.16 is: 620.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.28 : 885.60 = 450.16 : x
  2. Step 2: Convert to fraction form
    642.28/885.60 = 450.16/x
  3. Step 3: Cross multiply
    642.28x = 885.60 × 450.16
  4. Step 4: Simplify right side
    642.28x = 398,661.70
  5. Step 5: Solve for x
    x = 398,661.70/642.28
  6. Step 6: Final answer
    x = 620.70

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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.