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Finding the Fourth Proportional to 312.56, 468.08 and 190.45

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Solution

The fourth proportional to 312.56, 468.08 and 190.45 is: 285.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.56 : 468.08 = 190.45 : x
  2. Step 2: Convert to fraction form
    312.56/468.08 = 190.45/x
  3. Step 3: Cross multiply
    312.56x = 468.08 × 190.45
  4. Step 4: Simplify right side
    312.56x = 89,146.18
  5. Step 5: Solve for x
    x = 89,146.18/312.56
  6. Step 6: Final answer
    x = 285.21

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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.