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Finding the Fourth Proportional to 764.49, 1,145.66 and 620.31

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Solution

The fourth proportional to 764.49, 1,145.66 and 620.31 is: 929.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.49 : 1,145.66 = 620.31 : x
  2. Step 2: Convert to fraction form
    764.49/1,145.66 = 620.31/x
  3. Step 3: Cross multiply
    764.49x = 1,145.66 × 620.31
  4. Step 4: Simplify right side
    764.49x = 710,661.25
  5. Step 5: Solve for x
    x = 710,661.25/764.49
  6. Step 6: Final answer
    x = 929.59

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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.