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Finding the Fourth Proportional to 764.72, 1,146.76 and 379.92

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Solution

The fourth proportional to 764.72, 1,146.76 and 379.92 is: 569.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.72 : 1,146.76 = 379.92 : x
  2. Step 2: Convert to fraction form
    764.72/1,146.76 = 379.92/x
  3. Step 3: Cross multiply
    764.72x = 1,146.76 × 379.92
  4. Step 4: Simplify right side
    764.72x = 435,677.06
  5. Step 5: Solve for x
    x = 435,677.06/764.72
  6. Step 6: Final answer
    x = 569.72

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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.