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Finding the Fourth Proportional to 764.72, 1,147.08 and 277.76

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Solution

The fourth proportional to 764.72, 1,147.08 and 277.76 is: 416.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.72 : 1,147.08 = 277.76 : x
  2. Step 2: Convert to fraction form
    764.72/1,147.08 = 277.76/x
  3. Step 3: Cross multiply
    764.72x = 1,147.08 × 277.76
  4. Step 4: Simplify right side
    764.72x = 318,612.94
  5. Step 5: Solve for x
    x = 318,612.94/764.72
  6. Step 6: Final answer
    x = 416.64

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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.