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Finding the Fourth Proportional to 463.40, 639.48 and 266.90

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Solution

The fourth proportional to 463.40, 639.48 and 266.90 is: 368.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.40 : 639.48 = 266.90 : x
  2. Step 2: Convert to fraction form
    463.40/639.48 = 266.90/x
  3. Step 3: Cross multiply
    463.40x = 639.48 × 266.90
  4. Step 4: Simplify right side
    463.40x = 170,677.21
  5. Step 5: Solve for x
    x = 170,677.21/463.40
  6. Step 6: Final answer
    x = 368.32

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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.