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Finding the Fourth Proportional to 657.60, 985.79 and 328.34

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Solution

The fourth proportional to 657.60, 985.79 and 328.34 is: 492.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.60 : 985.79 = 328.34 : x
  2. Step 2: Convert to fraction form
    657.60/985.79 = 328.34/x
  3. Step 3: Cross multiply
    657.60x = 985.79 × 328.34
  4. Step 4: Simplify right side
    657.60x = 323,670.18
  5. Step 5: Solve for x
    x = 323,670.18/657.60
  6. Step 6: Final answer
    x = 492.20

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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.