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Finding the Fourth Proportional to 403.29, 556.56 and 309.87

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Solution

The fourth proportional to 403.29, 556.56 and 309.87 is: 427.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.29 : 556.56 = 309.87 : x
  2. Step 2: Convert to fraction form
    403.29/556.56 = 309.87/x
  3. Step 3: Cross multiply
    403.29x = 556.56 × 309.87
  4. Step 4: Simplify right side
    403.29x = 172,461.25
  5. Step 5: Solve for x
    x = 172,461.25/403.29
  6. Step 6: Final answer
    x = 427.64

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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.