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Finding the Fourth Proportional to 215.70, 322.80 and 187.17

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Solution

The fourth proportional to 215.70, 322.80 and 187.17 is: 280.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.70 : 322.80 = 187.17 : x
  2. Step 2: Convert to fraction form
    215.70/322.80 = 187.17/x
  3. Step 3: Cross multiply
    215.70x = 322.80 × 187.17
  4. Step 4: Simplify right side
    215.70x = 60,418.48
  5. Step 5: Solve for x
    x = 60,418.48/215.70
  6. Step 6: Final answer
    x = 280.10

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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.