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Finding the Fourth Proportional to 764.13, 1,145.49 and 399.16

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Solution

The fourth proportional to 764.13, 1,145.49 and 399.16 is: 598.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.13 : 1,145.49 = 399.16 : x
  2. Step 2: Convert to fraction form
    764.13/1,145.49 = 399.16/x
  3. Step 3: Cross multiply
    764.13x = 1,145.49 × 399.16
  4. Step 4: Simplify right side
    764.13x = 457,233.79
  5. Step 5: Solve for x
    x = 457,233.79/764.13
  6. Step 6: Final answer
    x = 598.37

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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.