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Finding the Fourth Proportional to 215.00, 322.39 and 85.03

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Solution

The fourth proportional to 215.00, 322.39 and 85.03 is: 127.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.00 : 322.39 = 85.03 : x
  2. Step 2: Convert to fraction form
    215.00/322.39 = 85.03/x
  3. Step 3: Cross multiply
    215.00x = 322.39 × 85.03
  4. Step 4: Simplify right side
    215.00x = 27,411.80
  5. Step 5: Solve for x
    x = 27,411.80/215.00
  6. Step 6: Final answer
    x = 127.50

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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.