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Finding the Fourth Proportional to 218.86, 328.28 and 56.55

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Solution

The fourth proportional to 218.86, 328.28 and 56.55 is: 84.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.86 : 328.28 = 56.55 : x
  2. Step 2: Convert to fraction form
    218.86/328.28 = 56.55/x
  3. Step 3: Cross multiply
    218.86x = 328.28 × 56.55
  4. Step 4: Simplify right side
    218.86x = 18,563.55
  5. Step 5: Solve for x
    x = 18,563.55/218.86
  6. Step 6: Final answer
    x = 84.82

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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.