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Finding the Fourth Proportional to 657.90, 986.90 and 170.96

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Solution

The fourth proportional to 657.90, 986.90 and 170.96 is: 256.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.90 : 986.90 = 170.96 : x
  2. Step 2: Convert to fraction form
    657.90/986.90 = 170.96/x
  3. Step 3: Cross multiply
    657.90x = 986.90 × 170.96
  4. Step 4: Simplify right side
    657.90x = 168,720.42
  5. Step 5: Solve for x
    x = 168,720.42/657.90
  6. Step 6: Final answer
    x = 256.45

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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.