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Finding the Fourth Proportional to 390.63, 539.67 and 361.06

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Solution

The fourth proportional to 390.63, 539.67 and 361.06 is: 498.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.63 : 539.67 = 361.06 : x
  2. Step 2: Convert to fraction form
    390.63/539.67 = 361.06/x
  3. Step 3: Cross multiply
    390.63x = 539.67 × 361.06
  4. Step 4: Simplify right side
    390.63x = 194,853.25
  5. Step 5: Solve for x
    x = 194,853.25/390.63
  6. Step 6: Final answer
    x = 498.82

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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.