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Finding the Fourth Proportional to 764.48, 1,144.89 and 438.86

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Solution

The fourth proportional to 764.48, 1,144.89 and 438.86 is: 657.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.48 : 1,144.89 = 438.86 : x
  2. Step 2: Convert to fraction form
    764.48/1,144.89 = 438.86/x
  3. Step 3: Cross multiply
    764.48x = 1,144.89 × 438.86
  4. Step 4: Simplify right side
    764.48x = 502,440.70
  5. Step 5: Solve for x
    x = 502,440.70/764.48
  6. Step 6: Final answer
    x = 657.24

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1.5x scale

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.