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Finding the Fourth Proportional to 764.20, 1,144.36 and 640.47

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Solution

The fourth proportional to 764.20, 1,144.36 and 640.47 is: 959.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.20 : 1,144.36 = 640.47 : x
  2. Step 2: Convert to fraction form
    764.20/1,144.36 = 640.47/x
  3. Step 3: Cross multiply
    764.20x = 1,144.36 × 640.47
  4. Step 4: Simplify right side
    764.20x = 732,927.91
  5. Step 5: Solve for x
    x = 732,927.91/764.20
  6. Step 6: Final answer
    x = 959.08

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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.