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Finding the Fourth Proportional to 490.31, 734.65 and 478.16

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Solution

The fourth proportional to 490.31, 734.65 and 478.16 is: 716.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.31 : 734.65 = 478.16 : x
  2. Step 2: Convert to fraction form
    490.31/734.65 = 478.16/x
  3. Step 3: Cross multiply
    490.31x = 734.65 × 478.16
  4. Step 4: Simplify right side
    490.31x = 351,275.38
  5. Step 5: Solve for x
    x = 351,275.38/490.31
  6. Step 6: Final answer
    x = 716.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.