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Finding the Fourth Proportional to 288.99, 432.87 and 220.54

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Solution

The fourth proportional to 288.99, 432.87 and 220.54 is: 330.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.99 : 432.87 = 220.54 : x
  2. Step 2: Convert to fraction form
    288.99/432.87 = 220.54/x
  3. Step 3: Cross multiply
    288.99x = 432.87 × 220.54
  4. Step 4: Simplify right side
    288.99x = 95,465.15
  5. Step 5: Solve for x
    x = 95,465.15/288.99
  6. Step 6: Final answer
    x = 330.34

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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.