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Finding the Fourth Proportional to 466.95, 643.77 and 391.28

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Solution

The fourth proportional to 466.95, 643.77 and 391.28 is: 539.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.95 : 643.77 = 391.28 : x
  2. Step 2: Convert to fraction form
    466.95/643.77 = 391.28/x
  3. Step 3: Cross multiply
    466.95x = 643.77 × 391.28
  4. Step 4: Simplify right side
    466.95x = 251,891.11
  5. Step 5: Solve for x
    x = 251,891.11/466.95
  6. Step 6: Final answer
    x = 539.44

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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.