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Finding the Fourth Proportional to 215.12, 322.40 and 123.76

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Solution

The fourth proportional to 215.12, 322.40 and 123.76 is: 185.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.12 : 322.40 = 123.76 : x
  2. Step 2: Convert to fraction form
    215.12/322.40 = 123.76/x
  3. Step 3: Cross multiply
    215.12x = 322.40 × 123.76
  4. Step 4: Simplify right side
    215.12x = 39,900.22
  5. Step 5: Solve for x
    x = 39,900.22/215.12
  6. Step 6: Final answer
    x = 185.48

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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.