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Finding the Fourth Proportional to 403.79, 557.76 and 279.23

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Solution

The fourth proportional to 403.79, 557.76 and 279.23 is: 385.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.79 : 557.76 = 279.23 : x
  2. Step 2: Convert to fraction form
    403.79/557.76 = 279.23/x
  3. Step 3: Cross multiply
    403.79x = 557.76 × 279.23
  4. Step 4: Simplify right side
    403.79x = 155,743.32
  5. Step 5: Solve for x
    x = 155,743.32/403.79
  6. Step 6: Final answer
    x = 385.70

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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.