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Finding the Fourth Proportional to 764.69, 1,146.29 and 399.51

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Solution

The fourth proportional to 764.69, 1,146.29 and 399.51 is: 598.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.69 : 1,146.29 = 399.51 : x
  2. Step 2: Convert to fraction form
    764.69/1,146.29 = 399.51/x
  3. Step 3: Cross multiply
    764.69x = 1,146.29 × 399.51
  4. Step 4: Simplify right side
    764.69x = 457,952.32
  5. Step 5: Solve for x
    x = 457,952.32/764.69
  6. Step 6: Final answer
    x = 598.88

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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.