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Finding the Fourth Proportional to 455.02, 682.80 and 391.30

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Solution

The fourth proportional to 455.02, 682.80 and 391.30 is: 587.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.02 : 682.80 = 391.30 : x
  2. Step 2: Convert to fraction form
    455.02/682.80 = 391.30/x
  3. Step 3: Cross multiply
    455.02x = 682.80 × 391.30
  4. Step 4: Simplify right side
    455.02x = 267,179.64
  5. Step 5: Solve for x
    x = 267,179.64/455.02
  6. Step 6: Final answer
    x = 587.18

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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.