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Finding the Fourth Proportional to 492.07, 678.77 and 317.42

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Solution

The fourth proportional to 492.07, 678.77 and 317.42 is: 437.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.07 : 678.77 = 317.42 : x
  2. Step 2: Convert to fraction form
    492.07/678.77 = 317.42/x
  3. Step 3: Cross multiply
    492.07x = 678.77 × 317.42
  4. Step 4: Simplify right side
    492.07x = 215,451.38
  5. Step 5: Solve for x
    x = 215,451.38/492.07
  6. Step 6: Final answer
    x = 437.85

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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.