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Finding the Fourth Proportional to 462.76, 639.80 and 442.36

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Solution

The fourth proportional to 462.76, 639.80 and 442.36 is: 611.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.76 : 639.80 = 442.36 : x
  2. Step 2: Convert to fraction form
    462.76/639.80 = 442.36/x
  3. Step 3: Cross multiply
    462.76x = 639.80 × 442.36
  4. Step 4: Simplify right side
    462.76x = 283,021.93
  5. Step 5: Solve for x
    x = 283,021.93/462.76
  6. Step 6: Final answer
    x = 611.60

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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.