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Finding the Fourth Proportional to 403.80, 557.10 and 279.24

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Solution

The fourth proportional to 403.80, 557.10 and 279.24 is: 385.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.80 : 557.10 = 279.24 : x
  2. Step 2: Convert to fraction form
    403.80/557.10 = 279.24/x
  3. Step 3: Cross multiply
    403.80x = 557.10 × 279.24
  4. Step 4: Simplify right side
    403.80x = 155,564.60
  5. Step 5: Solve for x
    x = 155,564.60/403.80
  6. Step 6: Final answer
    x = 385.25

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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.