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Finding the Fourth Proportional to 278.64, 417.12 and 217.68

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Solution

The fourth proportional to 278.64, 417.12 and 217.68 is: 325.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.64 : 417.12 = 217.68 : x
  2. Step 2: Convert to fraction form
    278.64/417.12 = 217.68/x
  3. Step 3: Cross multiply
    278.64x = 417.12 × 217.68
  4. Step 4: Simplify right side
    278.64x = 90,798.68
  5. Step 5: Solve for x
    x = 90,798.68/278.64
  6. Step 6: Final answer
    x = 325.86

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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.