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Finding the Fourth Proportional to 312.49, 468.93 and 212.53

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Solution

The fourth proportional to 312.49, 468.93 and 212.53 is: 318.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.49 : 468.93 = 212.53 : x
  2. Step 2: Convert to fraction form
    312.49/468.93 = 212.53/x
  3. Step 3: Cross multiply
    312.49x = 468.93 × 212.53
  4. Step 4: Simplify right side
    312.49x = 99,661.69
  5. Step 5: Solve for x
    x = 99,661.69/312.49
  6. Step 6: Final answer
    x = 318.93

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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.