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Finding the Fourth Proportional to 492.38, 678.85 and 403.53

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Solution

The fourth proportional to 492.38, 678.85 and 403.53 is: 556.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.38 : 678.85 = 403.53 : x
  2. Step 2: Convert to fraction form
    492.38/678.85 = 403.53/x
  3. Step 3: Cross multiply
    492.38x = 678.85 × 403.53
  4. Step 4: Simplify right side
    492.38x = 273,936.34
  5. Step 5: Solve for x
    x = 273,936.34/492.38
  6. Step 6: Final answer
    x = 556.35

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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.