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Finding the Fourth Proportional to 215.43, 322.88 and 128.83

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Solution

The fourth proportional to 215.43, 322.88 and 128.83 is: 193.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.43 : 322.88 = 128.83 : x
  2. Step 2: Convert to fraction form
    215.43/322.88 = 128.83/x
  3. Step 3: Cross multiply
    215.43x = 322.88 × 128.83
  4. Step 4: Simplify right side
    215.43x = 41,595.18
  5. Step 5: Solve for x
    x = 41,595.18/215.43
  6. Step 6: Final answer
    x = 193.08

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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.