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Finding the Fourth Proportional to 287.36, 431.06 and 215.68

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Solution

The fourth proportional to 287.36, 431.06 and 215.68 is: 323.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.36 : 431.06 = 215.68 : x
  2. Step 2: Convert to fraction form
    287.36/431.06 = 215.68/x
  3. Step 3: Cross multiply
    287.36x = 431.06 × 215.68
  4. Step 4: Simplify right side
    287.36x = 92,971.02
  5. Step 5: Solve for x
    x = 92,971.02/287.36
  6. Step 6: Final answer
    x = 323.54

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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.