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Finding the Fourth Proportional to 764, 1,145.95 and 399

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Solution

The fourth proportional to 764, 1,145.95 and 399 is: 598.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    764 : 1,145.95 = 399 : x
  2. Step 2: Convert to fraction form
    764/1,145.95 = 399/x
  3. Step 3: Cross multiply
    764x = 1,145.95 × 399
  4. Step 4: Simplify right side
    764x = 457,234.05
  5. Step 5: Solve for x
    x = 457,234.05/764
  6. Step 6: Final answer
    x = 598.47

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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.