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Finding the Fourth Proportional to 312.80, 468.95 and 215.06

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Solution

The fourth proportional to 312.80, 468.95 and 215.06 is: 322.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.80 : 468.95 = 215.06 : x
  2. Step 2: Convert to fraction form
    312.80/468.95 = 215.06/x
  3. Step 3: Cross multiply
    312.80x = 468.95 × 215.06
  4. Step 4: Simplify right side
    312.80x = 100,848.97
  5. Step 5: Solve for x
    x = 100,848.97/312.80
  6. Step 6: Final answer
    x = 322.41

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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.