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Finding the Fourth Proportional to 762.64, 1,144.56 and 438.28

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Solution

The fourth proportional to 762.64, 1,144.56 and 438.28 is: 657.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.64 : 1,144.56 = 438.28 : x
  2. Step 2: Convert to fraction form
    762.64/1,144.56 = 438.28/x
  3. Step 3: Cross multiply
    762.64x = 1,144.56 × 438.28
  4. Step 4: Simplify right side
    762.64x = 501,637.76
  5. Step 5: Solve for x
    x = 501,637.76/762.64
  6. Step 6: Final answer
    x = 657.76

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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.