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Finding the Fourth Proportional to 288.30, 432.05 and 216.08

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Solution

The fourth proportional to 288.30, 432.05 and 216.08 is: 323.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.30 : 432.05 = 216.08 : x
  2. Step 2: Convert to fraction form
    288.30/432.05 = 216.08/x
  3. Step 3: Cross multiply
    288.30x = 432.05 × 216.08
  4. Step 4: Simplify right side
    288.30x = 93,354.12
  5. Step 5: Solve for x
    x = 93,354.12/288.30
  6. Step 6: Final answer
    x = 323.81

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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.