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Finding the Fourth Proportional to 490, 734.99 and 124.78

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Solution

The fourth proportional to 490, 734.99 and 124.78 is: 187.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    490 : 734.99 = 124.78 : x
  2. Step 2: Convert to fraction form
    490/734.99 = 124.78/x
  3. Step 3: Cross multiply
    490x = 734.99 × 124.78
  4. Step 4: Simplify right side
    490x = 91,712.05
  5. Step 5: Solve for x
    x = 91,712.05/490
  6. Step 6: Final answer
    x = 187.17

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