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Finding the Fourth Proportional to 648.12, 970.92 and 339.60

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Solution

The fourth proportional to 648.12, 970.92 and 339.60 is: 508.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.12 : 970.92 = 339.60 : x
  2. Step 2: Convert to fraction form
    648.12/970.92 = 339.60/x
  3. Step 3: Cross multiply
    648.12x = 970.92 × 339.60
  4. Step 4: Simplify right side
    648.12x = 329,724.43
  5. Step 5: Solve for x
    x = 329,724.43/648.12
  6. Step 6: Final answer
    x = 508.74

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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.