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Finding the Fourth Proportional to 906.53, 1,359.78 and 257.26

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Solution

The fourth proportional to 906.53, 1,359.78 and 257.26 is: 385.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.53 : 1,359.78 = 257.26 : x
  2. Step 2: Convert to fraction form
    906.53/1,359.78 = 257.26/x
  3. Step 3: Cross multiply
    906.53x = 1,359.78 × 257.26
  4. Step 4: Simplify right side
    906.53x = 349,815.72
  5. Step 5: Solve for x
    x = 349,815.72/906.53
  6. Step 6: Final answer
    x = 385.89

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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.