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Finding the Fourth Proportional to 657.87, 986.88 and 219.15

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Solution

The fourth proportional to 657.87, 986.88 and 219.15 is: 328.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.87 : 986.88 = 219.15 : x
  2. Step 2: Convert to fraction form
    657.87/986.88 = 219.15/x
  3. Step 3: Cross multiply
    657.87x = 986.88 × 219.15
  4. Step 4: Simplify right side
    657.87x = 216,274.75
  5. Step 5: Solve for x
    x = 216,274.75/657.87
  6. Step 6: Final answer
    x = 328.75

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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.