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Finding the Fourth Proportional to 657.81, 986.75 and 219.03

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Solution

The fourth proportional to 657.81, 986.75 and 219.03 is: 328.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.81 : 986.75 = 219.03 : x
  2. Step 2: Convert to fraction form
    657.81/986.75 = 219.03/x
  3. Step 3: Cross multiply
    657.81x = 986.75 × 219.03
  4. Step 4: Simplify right side
    657.81x = 216,127.85
  5. Step 5: Solve for x
    x = 216,127.85/657.81
  6. Step 6: Final answer
    x = 328.56

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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.