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Finding the Fourth Proportional to 451.61, 621.36 and 353.19

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Solution

The fourth proportional to 451.61, 621.36 and 353.19 is: 485.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.61 : 621.36 = 353.19 : x
  2. Step 2: Convert to fraction form
    451.61/621.36 = 353.19/x
  3. Step 3: Cross multiply
    451.61x = 621.36 × 353.19
  4. Step 4: Simplify right side
    451.61x = 219,458.14
  5. Step 5: Solve for x
    x = 219,458.14/451.61
  6. Step 6: Final answer
    x = 485.95

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Double scale
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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.