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Finding the Fourth Proportional to 764.16, 1,145.16 and 398.18

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Solution

The fourth proportional to 764.16, 1,145.16 and 398.18 is: 596.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.16 : 1,145.16 = 398.18 : x
  2. Step 2: Convert to fraction form
    764.16/1,145.16 = 398.18/x
  3. Step 3: Cross multiply
    764.16x = 1,145.16 × 398.18
  4. Step 4: Simplify right side
    764.16x = 455,974.08
  5. Step 5: Solve for x
    x = 455,974.08/764.16
  6. Step 6: Final answer
    x = 596.70

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Double scale
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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.