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Finding the Fourth Proportional to 657.43, 986.28 and 218.75

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Solution

The fourth proportional to 657.43, 986.28 and 218.75 is: 328.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.43 : 986.28 = 218.75 : x
  2. Step 2: Convert to fraction form
    657.43/986.28 = 218.75/x
  3. Step 3: Cross multiply
    657.43x = 986.28 × 218.75
  4. Step 4: Simplify right side
    657.43x = 215,748.55
  5. Step 5: Solve for x
    x = 215,748.55/657.43
  6. Step 6: Final answer
    x = 328.17

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.