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Finding the Fourth Proportional to 403.35, 604.90 and 256.89

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Solution

The fourth proportional to 403.35, 604.90 and 256.89 is: 385.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.35 : 604.90 = 256.89 : x
  2. Step 2: Convert to fraction form
    403.35/604.90 = 256.89/x
  3. Step 3: Cross multiply
    403.35x = 604.90 × 256.89
  4. Step 4: Simplify right side
    403.35x = 155,392.76
  5. Step 5: Solve for x
    x = 155,392.76/403.35
  6. Step 6: Final answer
    x = 385.26

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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.