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Finding the Fourth Proportional to 403.39, 556.89 and 315.91

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Solution

The fourth proportional to 403.39, 556.89 and 315.91 is: 436.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.39 : 556.89 = 315.91 : x
  2. Step 2: Convert to fraction form
    403.39/556.89 = 315.91/x
  3. Step 3: Cross multiply
    403.39x = 556.89 × 315.91
  4. Step 4: Simplify right side
    403.39x = 175,927.12
  5. Step 5: Solve for x
    x = 175,927.12/403.39
  6. Step 6: Final answer
    x = 436.12

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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.