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Finding the Fourth Proportional to 463.20, 639.21 and 266.70

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Solution

The fourth proportional to 463.20, 639.21 and 266.70 is: 368.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.20 : 639.21 = 266.70 : x
  2. Step 2: Convert to fraction form
    463.20/639.21 = 266.70/x
  3. Step 3: Cross multiply
    463.20x = 639.21 × 266.70
  4. Step 4: Simplify right side
    463.20x = 170,477.31
  5. Step 5: Solve for x
    x = 170,477.31/463.20
  6. Step 6: Final answer
    x = 368.04

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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.