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Finding the Fourth Proportional to 764.78, 1,146.35 and 581.72

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Solution

The fourth proportional to 764.78, 1,146.35 and 581.72 is: 871.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.78 : 1,146.35 = 581.72 : x
  2. Step 2: Convert to fraction form
    764.78/1,146.35 = 581.72/x
  3. Step 3: Cross multiply
    764.78x = 1,146.35 × 581.72
  4. Step 4: Simplify right side
    764.78x = 666,854.72
  5. Step 5: Solve for x
    x = 666,854.72/764.78
  6. Step 6: Final answer
    x = 871.96

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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.