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Finding the Fourth Proportional to 426.48, 639.60 and 118.35

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Solution

The fourth proportional to 426.48, 639.60 and 118.35 is: 177.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.48 : 639.60 = 118.35 : x
  2. Step 2: Convert to fraction form
    426.48/639.60 = 118.35/x
  3. Step 3: Cross multiply
    426.48x = 639.60 × 118.35
  4. Step 4: Simplify right side
    426.48x = 75,696.66
  5. Step 5: Solve for x
    x = 75,696.66/426.48
  6. Step 6: Final answer
    x = 177.49

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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.