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Finding the Fourth Proportional to 455.60, 682.70 and 339.50

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Solution

The fourth proportional to 455.60, 682.70 and 339.50 is: 508.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.60 : 682.70 = 339.50 : x
  2. Step 2: Convert to fraction form
    455.60/682.70 = 339.50/x
  3. Step 3: Cross multiply
    455.60x = 682.70 × 339.50
  4. Step 4: Simplify right side
    455.60x = 231,771.54
  5. Step 5: Solve for x
    x = 231,771.54/455.60
  6. Step 6: Final answer
    x = 508.72

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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.