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Finding the Fourth Proportional to 492.05, 677.68 and 386.98

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Solution

The fourth proportional to 492.05, 677.68 and 386.98 is: 532.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.05 : 677.68 = 386.98 : x
  2. Step 2: Convert to fraction form
    492.05/677.68 = 386.98/x
  3. Step 3: Cross multiply
    492.05x = 677.68 × 386.98
  4. Step 4: Simplify right side
    492.05x = 262,248.61
  5. Step 5: Solve for x
    x = 262,248.61/492.05
  6. Step 6: Final answer
    x = 532.97

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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.