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Finding the Fourth Proportional to 215.04, 322.08 and 142.80

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Solution

The fourth proportional to 215.04, 322.08 and 142.80 is: 213.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.04 : 322.08 = 142.80 : x
  2. Step 2: Convert to fraction form
    215.04/322.08 = 142.80/x
  3. Step 3: Cross multiply
    215.04x = 322.08 × 142.80
  4. Step 4: Simplify right side
    215.04x = 45,993.02
  5. Step 5: Solve for x
    x = 45,993.02/215.04
  6. Step 6: Final answer
    x = 213.88

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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.