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Finding the Fourth Proportional to 657.40, 986.15 and 170.50

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Solution

The fourth proportional to 657.40, 986.15 and 170.50 is: 255.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.40 : 986.15 = 170.50 : x
  2. Step 2: Convert to fraction form
    657.40/986.15 = 170.50/x
  3. Step 3: Cross multiply
    657.40x = 986.15 × 170.50
  4. Step 4: Simplify right side
    657.40x = 168,137.72
  5. Step 5: Solve for x
    x = 168,137.72/657.40
  6. Step 6: Final answer
    x = 255.76

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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.