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Finding the Fourth Proportional to 463.88, 639.70 and 390.96

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Solution

The fourth proportional to 463.88, 639.70 and 390.96 is: 539.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.88 : 639.70 = 390.96 : x
  2. Step 2: Convert to fraction form
    463.88/639.70 = 390.96/x
  3. Step 3: Cross multiply
    463.88x = 639.70 × 390.96
  4. Step 4: Simplify right side
    463.88x = 250,097.11
  5. Step 5: Solve for x
    x = 250,097.11/463.88
  6. Step 6: Final answer
    x = 539.14

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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.