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Finding the Fourth Proportional to 763.02, 1,144.80 and 438.30

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Solution

The fourth proportional to 763.02, 1,144.80 and 438.30 is: 657.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.02 : 1,144.80 = 438.30 : x
  2. Step 2: Convert to fraction form
    763.02/1,144.80 = 438.30/x
  3. Step 3: Cross multiply
    763.02x = 1,144.80 × 438.30
  4. Step 4: Simplify right side
    763.02x = 501,765.84
  5. Step 5: Solve for x
    x = 501,765.84/763.02
  6. Step 6: Final answer
    x = 657.61

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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.