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Finding the Fourth Proportional to 764.19, 1,146.61 and 325.74

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Solution

The fourth proportional to 764.19, 1,146.61 and 325.74 is: 488.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.19 : 1,146.61 = 325.74 : x
  2. Step 2: Convert to fraction form
    764.19/1,146.61 = 325.74/x
  3. Step 3: Cross multiply
    764.19x = 1,146.61 × 325.74
  4. Step 4: Simplify right side
    764.19x = 373,496.74
  5. Step 5: Solve for x
    x = 373,496.74/764.19
  6. Step 6: Final answer
    x = 488.75

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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.