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Finding the Fourth Proportional to 500.80, 751.56 and 257.28

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Solution

The fourth proportional to 500.80, 751.56 and 257.28 is: 386.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.80 : 751.56 = 257.28 : x
  2. Step 2: Convert to fraction form
    500.80/751.56 = 257.28/x
  3. Step 3: Cross multiply
    500.80x = 751.56 × 257.28
  4. Step 4: Simplify right side
    500.80x = 193,361.36
  5. Step 5: Solve for x
    x = 193,361.36/500.80
  6. Step 6: Final answer
    x = 386.10

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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.