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Finding the Fourth Proportional to 603.25, 905.16 and 256.67

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Solution

The fourth proportional to 603.25, 905.16 and 256.67 is: 385.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.25 : 905.16 = 256.67 : x
  2. Step 2: Convert to fraction form
    603.25/905.16 = 256.67/x
  3. Step 3: Cross multiply
    603.25x = 905.16 × 256.67
  4. Step 4: Simplify right side
    603.25x = 232,327.42
  5. Step 5: Solve for x
    x = 232,327.42/603.25
  6. Step 6: Final answer
    x = 385.13

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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.