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Finding the Fourth Proportional to 390.03, 537.99 and 279.32

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Solution

The fourth proportional to 390.03, 537.99 and 279.32 is: 385.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.03 : 537.99 = 279.32 : x
  2. Step 2: Convert to fraction form
    390.03/537.99 = 279.32/x
  3. Step 3: Cross multiply
    390.03x = 537.99 × 279.32
  4. Step 4: Simplify right side
    390.03x = 150,268.68
  5. Step 5: Solve for x
    x = 150,268.68/390.03
  6. Step 6: Final answer
    x = 385.27

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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.