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Finding the Fourth Proportional to 403.47, 556.43 and 256.05

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Solution

The fourth proportional to 403.47, 556.43 and 256.05 is: 353.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.47 : 556.43 = 256.05 : x
  2. Step 2: Convert to fraction form
    403.47/556.43 = 256.05/x
  3. Step 3: Cross multiply
    403.47x = 556.43 × 256.05
  4. Step 4: Simplify right side
    403.47x = 142,472.62
  5. Step 5: Solve for x
    x = 142,472.62/403.47
  6. Step 6: Final answer
    x = 353.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.