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Finding the Fourth Proportional to 764.61, 1,145.88 and 490.56

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Solution

The fourth proportional to 764.61, 1,145.88 and 490.56 is: 735.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.61 : 1,145.88 = 490.56 : x
  2. Step 2: Convert to fraction form
    764.61/1,145.88 = 490.56/x
  3. Step 3: Cross multiply
    764.61x = 1,145.88 × 490.56
  4. Step 4: Simplify right side
    764.61x = 562,122.89
  5. Step 5: Solve for x
    x = 562,122.89/764.61
  6. Step 6: Final answer
    x = 735.18

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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.