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Finding the Fourth Proportional to 288.64, 432.40 and 216.80

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Solution

The fourth proportional to 288.64, 432.40 and 216.80 is: 324.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.64 : 432.40 = 216.80 : x
  2. Step 2: Convert to fraction form
    288.64/432.40 = 216.80/x
  3. Step 3: Cross multiply
    288.64x = 432.40 × 216.80
  4. Step 4: Simplify right side
    288.64x = 93,744.32
  5. Step 5: Solve for x
    x = 93,744.32/288.64
  6. Step 6: Final answer
    x = 324.78

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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.