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Finding the Fourth Proportional to 657.62, 986.56 and 218.94

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Solution

The fourth proportional to 657.62, 986.56 and 218.94 is: 328.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.62 : 986.56 = 218.94 : x
  2. Step 2: Convert to fraction form
    657.62/986.56 = 218.94/x
  3. Step 3: Cross multiply
    657.62x = 986.56 × 218.94
  4. Step 4: Simplify right side
    657.62x = 215,996.90
  5. Step 5: Solve for x
    x = 215,996.90/657.62
  6. Step 6: Final answer
    x = 328.45

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1.5x scale

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.