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Finding the Fourth Proportional to 764.15, 1,146.22 and 399.19

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Solution

The fourth proportional to 764.15, 1,146.22 and 399.19 is: 598.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.15 : 1,146.22 = 399.19 : x
  2. Step 2: Convert to fraction form
    764.15/1,146.22 = 399.19/x
  3. Step 3: Cross multiply
    764.15x = 1,146.22 × 399.19
  4. Step 4: Simplify right side
    764.15x = 457,557.85
  5. Step 5: Solve for x
    x = 457,557.85/764.15
  6. Step 6: Final answer
    x = 598.78

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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.