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Finding the Fourth Proportional to 403.74, 556.59 and 279.19

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Solution

The fourth proportional to 403.74, 556.59 and 279.19 is: 384.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.74 : 556.59 = 279.19 : x
  2. Step 2: Convert to fraction form
    403.74/556.59 = 279.19/x
  3. Step 3: Cross multiply
    403.74x = 556.59 × 279.19
  4. Step 4: Simplify right side
    403.74x = 155,394.36
  5. Step 5: Solve for x
    x = 155,394.36/403.74
  6. Step 6: Final answer
    x = 384.89

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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.