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Finding the Fourth Proportional to 764.65, 1,147.72 and 517.06

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Solution

The fourth proportional to 764.65, 1,147.72 and 517.06 is: 776.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.65 : 1,147.72 = 517.06 : x
  2. Step 2: Convert to fraction form
    764.65/1,147.72 = 517.06/x
  3. Step 3: Cross multiply
    764.65x = 1,147.72 × 517.06
  4. Step 4: Simplify right side
    764.65x = 593,437.99
  5. Step 5: Solve for x
    x = 593,437.99/764.65
  6. Step 6: Final answer
    x = 776.09

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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.