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Finding the Fourth Proportional to 288.16, 431.88 and 215.68

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Solution

The fourth proportional to 288.16, 431.88 and 215.68 is: 323.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.16 : 431.88 = 215.68 : x
  2. Step 2: Convert to fraction form
    288.16/431.88 = 215.68/x
  3. Step 3: Cross multiply
    288.16x = 431.88 × 215.68
  4. Step 4: Simplify right side
    288.16x = 93,147.88
  5. Step 5: Solve for x
    x = 93,147.88/288.16
  6. Step 6: Final answer
    x = 323.25

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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.