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Finding the Fourth Proportional to 618.87, 927.56 and 345.18

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Solution

The fourth proportional to 618.87, 927.56 and 345.18 is: 517.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.87 : 927.56 = 345.18 : x
  2. Step 2: Convert to fraction form
    618.87/927.56 = 345.18/x
  3. Step 3: Cross multiply
    618.87x = 927.56 × 345.18
  4. Step 4: Simplify right side
    618.87x = 320,173.43
  5. Step 5: Solve for x
    x = 320,173.43/618.87
  6. Step 6: Final answer
    x = 517.35

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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.