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Finding the Fourth Proportional to 403.68, 556.43 and 279.15

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Solution

The fourth proportional to 403.68, 556.43 and 279.15 is: 384.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.68 : 556.43 = 279.15 : x
  2. Step 2: Convert to fraction form
    403.68/556.43 = 279.15/x
  3. Step 3: Cross multiply
    403.68x = 556.43 × 279.15
  4. Step 4: Simplify right side
    403.68x = 155,325.91
  5. Step 5: Solve for x
    x = 155,325.91/403.68
  6. Step 6: Final answer
    x = 384.77

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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.